EX-10.3





 Exhibit 10.3 

EXECUTION VERSION 
 SPONSOR
SUPPORT AGREEMENT 
 This SPONSOR SUPPORT AGREEMENT (this “Agreement”) is made and entered into as of January 13,
2020, by and among LiveVox Holdings, Inc., a Delaware corporation (the “Company”), CFI Sponsor LLC, a Delaware limited liability company (“Sponsor”), each of the other Persons set forth on
Schedule A hereto (each of such Persons and the Sponsor, a “Supporting Party” and, collectively, the “Supporting Parties”), and Crescent Acquisition Corp, a Delaware corporation
(“Parent”). 
 RECITALS 

A.    Parent, Function Acquisition I Corp, a Delaware corporation and a direct, wholly owned subsidiary of Parent
(“First Merger Sub”),Function Acquisition II LLC, a Delaware limited liability company and a direct, wholly owned subsidiary of Parent (“Second Merger Sub”), the Company, and GGC Services Holdco, Inc., a Delaware
corporation, solely in its capacity as representative, agent and attorney-in-fact of the Company Stockholder thereunder (in such capacity, the “Stockholder
Representative”) are entering into an Agreement and Plan of Merger of even date herewith (the “Merger Agreement”), which provides (upon the terms and subject to the conditions set forth therein) for a business combination
transaction by which: (i) First Merger Sub will merge with and into the Company (the “First Merger”), with the Company being the surviving corporation of the First Merger (the Company, in its capacity as the surviving
corporation of the First Merger, is sometimes referred to as the “Surviving Corporation”); and (ii) immediately following the First Merger and as part of the same overall transaction as the First Merger, the Surviving
Corporation will merge with and into Second Merger Sub (the “Second Merger” and, together with the First Merger, the “Mergers”) with Second Merger Sub being the surviving entity of the Second Merger and a wholly
owned subsidiary of Parent (Second Merger Sub, in its capacity as the surviving entity of the Second Merger, is sometimes referred to as the “Surviving Entity”). 

B.    The Supporting Parties are the beneficial and record owners of such number and type of Parent equity securities as
are indicated next to each Supporting Party’s name on Schedule A (together with any New Subject Securities (as defined below), the “Subject Securities”). 

C.    The Supporting Parties and Parent are entering into this Agreement in order to induce the Company to enter into the
Merger Agreement and cause the Transactions to be consummated. 
 NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth below and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound, do hereby agree as
follows: 
 1.    Definitions. Capitalized terms used but not otherwise defined herein shall have the respective
meanings ascribed to such terms in the Merger Agreement. When used in this Agreement, the following terms in all of their tenses, cases and correlative forms shall have the meanings assigned to them in this Section 1 or
elsewhere in this Agreement. 

  
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 “Associated Parties” shall mean (a) each Supporting Party’s
predecessors, successors, executors, administrators, trusts, spouse, heirs and estate; (b) each Supporting Party’s past, present and future assigns; (c) each entity that each Supporting Party, as applicable, has the power to bind (by
such Supporting Party’s acts or signature) or over which such Supporting Party directly or indirectly exercises control; and (d) each entity of which each Supporting Party owns, directly or indirectly, at least a majority of the
outstanding equity, beneficial, proprietary, ownership or voting interests. 
 “Claim” shall mean all past, present and
future Legal Proceedings, disputes, controversies, demands, rights, obligations, damages, liabilities (whether direct or indirect, absolute, accrued, contingent or otherwise), contracts and causes of action of every kind and nature (whether matured
or unmatured, absolute or contingent), including any unknown, inchoate, unsuspected or undisclosed claim. 
 “Consent”
shall mean any consent, approval, authorization, permit or notice. 
 “Expiration Time” shall mean the earliest to occur of
(a) the Effective Time, and (b) such date and time as the Merger Agreement shall have been terminated validly in accordance with its terms. 

“Immediate Family” shall mean any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, sibling, mother-in-law, father-in-law,
son-in-law, daughter-in-law, brother-in-law, or sister-in-law, and shall include adoptive relationships. 

“Permitted Transferee” shall mean: (a) with respect to any Person that is an individual, any member of such
individual’s Immediate Family and/or any trust, partnership, limited liability company, or other similar estate planning vehicle that such individual controls and the beneficiaries of which are only such individual or such individual’s
Immediate Family, and any other transferee who receives Subject Securities by will or the laws of descent and distribution; and (b) with respect to any other Person, any Affiliate or equityholder of such Person. 

“Releasees” shall mean: (a) Parent; (b) the Group Companies; (c) Parent’s current and future Affiliates
(including First Merger Sub, Second Merger Sub, following the First Merger, the Surviving Corporation, and, following the Second Merger, the Surviving Entity); (d) the respective Representatives of the Persons referred to in clauses “(a)”
through “(c)” above; and (e) the respective successors and assigns of the Persons identified or otherwise referred to in the foregoing clauses “(a)” through “(d).” 

“Voting Period” shall mean the period commencing on (and including) the date of this Agreement and ending on (and including)
the Expiration Time. 
 2.    Agreement to Retain the Subject Securities and Cancellation of Certain Securities.

 (a)    No Transfer of Subject Securities. Each Supporting Party agrees not to, directly or indirectly, at any
time during the Voting Period, other than as may be required by a court order or other Legal Requirement or provided in or permitted by the Merger Agreement (including the disclosure schedules thereto), (i) sell, assign, transfer (including by
operation of law), pledge, dispose of or otherwise encumber, or otherwise agree to do any of the foregoing in 

  
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respect of (each, a “Transfer”) any of the Subject Securities, (ii) deposit any Subject Securities into a voting trust or enter into a voting agreement or arrangement or
grant any proxy or power of attorney with respect thereto that is inconsistent with this Agreement, (iii) enter into any Contract, option or other arrangement or undertaking with respect to the direct or indirect sale, assignment, transfer
(including by operation of law) or other disposition by such Supporting Party of any Subject Securities, or (iv) take any action that would make any representation or warranty of such Supporting Party herein untrue or incorrect in any material
respect or have the effect of preventing or disabling such Supporting Party from performing such Supporting Party’s obligations hereunder, except, in each case, pursuant to, or in furtherance of, the Transactions; provided, however, that
any Supporting Party may transfer Subject Securities to Permitted Transferees; provided that prior to and as a condition to the effectiveness of such transfer, each Person to whom any Subject Securities or any interest in any of such Subject
Securities is or may be transferred shall have executed and delivered to the Company a counterpart of this Agreement pursuant to which such Person shall be bound by all of the terms and provisions of this Agreement, and shall have agreed in writing
with the Company to hold such Subject Securities or interest in such Subject Securities subject to all of the terms and provisions of this Agreement. 

(b)    Additional Securities. Each Supporting Party agrees that any equity securities of Parent that it purchases
or otherwise hereafter acquires (including as a result of a stock dividend, subdivision, reclassification, recapitalization, split, combination or exchange of shares, or any similar event) or with respect to which it otherwise acquires sole or
shared voting power after the execution of this Agreement and prior to the Expiration Time (the “New Subject Securities”) shall be subject to the terms and conditions of this Agreement to the same extent as if they constituted the
Subject Securities set forth on Schedule A attached hereto. 
 (c)    Unpermitted
Transfers. Any Transfer or attempted Transfer of any Subject Securities or New Subject Securities in violation of any provision of this Agreement shall be void ab initio and of no force or effect. 

(d)    Cancellation of Certain Securities. Notwithstanding anything to the contrary, Sponsor hereby agrees to,
substantially concurrent with and contingent upon the Closing, transfer, convey and assign to Parent all of its right, title and interest in and to 7,000,000 Private Placement Warrants and 2,725,000 shares of Parent Class F Stock, and Parent
hereby agrees to cancel and retire such Private Placement Warrants upon receipt. 
 3.    Agreement to Vote and
Approve; No Redemption. 
 (a)    Each Supporting Party irrevocably and unconditionally agrees that, from and after
the date hereof until the Expiration Time (the “Voting Period”), at any meeting of the stockholders of Parent or any adjournment or postponement thereof, or in connection with any action by written consent of the stockholders of
Parent, it shall: (i) appear at each such meeting or otherwise cause all Subject Securities beneficially owned which such Supporting Party has a right to vote or owned of record by such Supporting Party to be counted as present thereat for
purposes of calculating a quorum; and (ii) vote (or cause to be voted), in person or by proxy, or deliver a written consent (or cause a consent to be delivered) covering, the Subject Securities beneficially owned which such Supporting Party has
a right to vote or owned of record by such Supporting Party, (A) in favor of the approval of (1) the adoption of the Merger Agreement and approval of 

  
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the Transactions; (2) the issuance of shares of Parent Class A Stock in connection with Section 2.6 of the Merger Agreement; (3) the amendment and restatement of the Parent
Charter substantially in the form of the Parent A&R Charter attached to the Merger Agreement as Exhibit C; (4) adoption of an equity incentive plan in accordance with Section 7.20 of the Merger Agreement; and (5) any other
proposals or actions the Parties deem necessary or desirable to consummate the Transaction (collectively, the “Transaction Proposals”), (B) against any Acquisition Proposal with respect to any Person other than the Company,
(C) against any action that would be a breach of Parent’s representations, warranties, covenants or agreements in the Merger Agreement, and (D) against the following actions (other than pursuant to, or in furtherance of, the
Transactions): (1) any reorganization, recapitalization, dissolution or liquidation of Parent; (2) any change in a majority of the Parent Board; (3) any amendment to the Parent Organizational Documents (other than adoption of the Parent
A&R Charter and the Parent A&R Bylaws); (4) any change in the capitalization of Parent or Parent’s corporate structure; and (5) any other action, proposal, agreement or transaction or proposed transaction that is intended, or would
reasonably be expected, to materially impede, interfere with, delay, postpone, discourage or adversely affect the Transactions. For the avoidance of doubt, each Supporting Party, as applicable, shall retain at all times the right to vote any Subject
Securities, including New Subject Securities, beneficially owned which such Supporting Party has a right to vote or owned of record by such Supporting Party in such Supporting Party’s sole discretion, and without any other limitation, on any
matters other than those explicitly set forth in this Agreement that are at any time or from time to time presented for consideration to Parent’s stockholders. 

(b)    Each Supporting Party irrevocably and unconditionally agrees that, during the Voting Period, such Supporting Party
shall not elect to cause Parent to redeem any Subject Securities beneficially owned or owned of record by such Supporting Party in connection with the Transaction Proposals. 

(c)    The obligations of the Supporting Parties specified in this Agreement, including this
Section 3, shall apply whether or not the Parent Board shall have effected a Change in Recommendation. 

(d)    During the Voting Period, no Supporting Party shall enter into any agreement or understanding with any Person to
vote or give instructions in any manner inconsistent with this Section 3. 
 4.    Waiver
of Anti-Dilution Provision; Release. 
 (a)    Each Supporting Party hereby waives (for itself, for its successors,
heirs and assigns), to the fullest extent permitted by law, the ability to adjust the Initial Conversion Ratio (as defined in the Parent Charter) pursuant to Section 4.3(b)(ii) of the Parent Charter in connection with the issuance of additional
Parent Class A Stock in the Transactions—and each Supporting Party, for the avoidance of doubt, hereby consents to such waiver. This waiver shall be applicable only in connection with the Transactions and this Agreement (and any Parent
Class A Stock issued in connection with the Transactions) and shall be void and of no force and effect following the Expiration Time. 

  
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 (b)    In exchange for the Company’s and Parent’s entry into
the Merger Agreement, this Agreement and agreement to consummate the Transactions, which constitute good and valuable consideration for this release of Claims, effective as of the Effective Time, each Supporting Party, on such Supporting
Party’s behalf and on behalf of each of the applicable Associated Parties, hereby (i) irrevocably, unconditionally and completely releases, acquits and forever discharges each of the Releasees of and from any and all Claims, and
(ii) irrevocably, unconditionally and completely waives and relinquishes each and every Claim, in the case of each of clauses (i) and (ii), that such Supporting Party or any of the applicable Associated Parties may have had in the past,
may now have or may have in the future against any of the Releasees to the extent relating to or arising out of such Supporting Party’s or any of the applicable Associated Parties’ (A) employment or consulting relationship with Parent
at any time up to and including the date of this Agreement, (B) current or former status as a director, officer or consultant of or to Parent at any time up to and including the date of this Agreement, or (C) current or former status as a
stockholder, holder of warrants, stock options or other equity securities of Parent, including (1) Claims relating to the preparation, negotiation, execution or consummation of this Agreement, the Merger Agreement, or any other agreement,
document, certificate or instrument delivered in connection with the Transactions, and (2) Claims in respect of a breach by the Parent Board or its individual directors and officers of their fiduciary obligations, including in connection with
the negotiation and execution of the Merger Agreement and the consummation of the Transactions; provided, however, that (w) such Supporting Party is not releasing any rights available to it under the Merger Agreement or any other
agreement entered into by such Supporting Party in connection with the Transactions, or any other amount payable pursuant to any retention or equity incentive plan established by Parent in connection with the Mergers for the benefit of such
Supporting Party; (x) if (and only if) such Supporting Party is an officer or director of Parent, such Supporting Party is not releasing Supporting Party’s rights, if any, to indemnification that Supporting Party may have under
Parent’s Governing Documents or any indemnification agreement between such Supporting Party and Parent, as well as with respect to any directors’ and officers’ liability insurance policy maintained by Parent; (y) such Supporting
Party is not releasing any rights set forth in Section 9 of that certain Letter Agreement, dated March 7, 2019, by and among Parent, Sponsor and each of the Parent’s then officers and directors, including each of the other Support
Parties (the “Letter Agreement”); and (z) if applicable to such Supporting Party, such Supporting Party is not releasing any rights available to it to receive salaries, bonuses, benefits, accrued vacation, expense
reimbursements and expenses or other compensation earned in respect of employment with, or services provided to, Parent.

(c)    Each Supporting Party, on such Supporting Party’s behalf and on behalf of each of the applicable Associated
Parties, hereby irrevocably covenants to refrain from asserting any Claim, or commencing, instituting or causing to be commenced, any Legal Proceeding of any kind against any Releasee based upon any Claim released or purported to be released
pursuant to this Section 4. If such Supporting Party (or any of the applicable Associated Parties) brings any claim, suit, action or manner of action against any Releasee in administrative proceedings, in arbitration or
admiralty, at law, in equity, or mixed, with respect to any Claim released pursuant to this Section 4, then such Supporting Party shall indemnify such Releasee in the amount or value of any final judgment or settlement
(monetary or other) and any related cost (including reasonable legal fees) entered against, paid or incurred by the Releasee. 

  
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 (d)    Each Supporting Party, on such Supporting Party’s behalf and
on behalf of each of the applicable Associated Parties, expressly waives and releases any and all rights and benefits under Section 1542 of the California Civil Code (or any analogous law of any other state), which reads as follows: 

A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS THAT THE CREDITOR OR RELEASING PARTY DOES NOT KNOW OR SUSPECT TO EXIST IN HIS OR HER FAVOR AT THE
TIME OF EXECUTING THE RELEASE, AND THAT IF KNOWN BY HIM OR HER MUST HAVE MATERIALLY AFFECTED HIS OR HER SETTLEMENT WITH THE DEBTOR OR RELEASING PARTY. 

(e)    Each Supporting Party understands and acknowledges (on its own behalf and on behalf of each of the applicable
Associated Parties) that it may discover facts different from, or in addition to, those which it knows or believes to be true with respect to the Claims, and agrees that this release shall be and remain effective in all respects notwithstanding any
subsequent discovery of different and/or additional facts. 
 5.    Entry into Closing Agreements. Sponsor hereby
agrees that it shall execute and deliver to Parent a copy of each of the Stockholders Agreement and the A&R Registration Rights Agreement (each in substantially the form attached to the Merger Agreement) at Closing. 

6.    Loans and Advances. Sponsor represents and warrants to Parent that, as of the date hereof, there are no
outstanding loans or advances from the Supporting Parties or their respective Affiliates to Parent or its subsidiaries. Notwithstanding anything herein to the contrary, each Supporting Party waives any rights under the Letter Agreement to convert
all or any portion of any amounts loaned or advanced to Parent or its subsidiaries at any time prior to or at the Closing into warrants to purchase shares of Parent Class A Stock. 

7.    Representations and Warranties of the Supporting Parties. Each of the Supporting Parties hereby represents
and warrants (severally and not jointly) to Parent and the Company as follows: 
 (a)    Authorization, etc. Such
Supporting Party has the power, authority and capacity to execute and deliver this Agreement and to perform such Supporting Party’s obligations hereunder. This Agreement has been duly executed and delivered by such Supporting Party and
constitutes a legal, valid and binding obligation of such Supporting Party, enforceable against such Supporting Party in accordance with its terms, subject only to: (i) laws of general application relating to bankruptcy, insolvency and the
relief of debtors; and (ii) rules of law governing specific performance, injunctive relief and other equitable remedies. To the extent that such Supporting Party is a natural person who is married and is a resident in a community property
state, such Supporting Party represents and warrants that such Supporting Party has the absolute and unrestricted power, authority and capacity to execute and deliver this Agreement and to perform such Supporting Party’s obligations hereunder,
notwithstanding any laws related to community property. To the extent that such Supporting Party is not a natural person, including if such Supporting Party is a trust, such Supporting Party hereby further represents and warrants that: (A) such
Supporting Party is duly organized, validly existing and in good standing under the laws 

  
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of the jurisdiction in which it was organized; (B) the undersigned has the power to execute and deliver this Agreement on behalf of such Supporting Party; (C) such Supporting Party has
taken all necessary action to authorize the execution, delivery and performance of this Agreement; and (D) the execution, delivery and performance of this Agreement by such Supporting Party will not violate any provision of such Supporting
Party’s Governing Documents. Such Supporting Party has read and understood this Agreement, including the complete release of Claims and waiver of jury trial contained herein, has consulted, or had the opportunity to consult, with such
Supporting Party’s legal counsel or other advisors with respect thereto, has knowingly and voluntarily elected to sign and accept this Agreement, and has not relied upon any promise, statement, or representation that is not set forth explicitly
herein in deciding to sign and accept this Agreement. 
 (b)    No Conflicts or Consents. The execution
and delivery of this Agreement by such Supporting Party do not, and the performance of this Agreement by such Supporting Party will not: (i) conflict with or violate any Legal Requirement or Order applicable to such Supporting Party or by which
such Supporting Party or any of such Supporting Party’s assets is or may be bound or affected; or (ii) result in or constitute (with or without notice or lapse of time) any breach of or default under, or give to any other Person (with or
without notice or lapse of time) any right of termination, amendment, acceleration or cancellation of, or result (with or without notice or lapse of time) in the creation of any Lien on any of the securities of Parent owned by such Supporting Party
pursuant to, any Contract to which such Supporting Party is a party or by which such Supporting Party or any of such Supporting Party’s Affiliates or assets is or may be bound or affected. The execution and delivery of this Agreement by such
Supporting Party do not, and the performance of this Agreement by such Supporting Party will not, require any Consent of any Person. 

(c)    Title to Securities. As of the date of this Agreement: (i) such Supporting Party has good and valid
title to and holds of record (free and clear of any Liens other than those arising under applicable securities laws or as would not otherwise restrict the performance of such Supporting Party’s obligations pursuant to this Agreement) the
number, class and series of shares of Subject Securities set forth next to such Supporting Party’s name on Schedule A; and (ii) such Supporting Party does not own any shares of capital stock or other securities of
Parent or any option, warrant, convertible note or other right to acquire (by purchase, conversion or otherwise) any shares of capital stock or other securities of Parent, other than as set forth on Schedule A. 

(d)    Litigation. There is no Legal Proceeding by or before any Governmental Entity pending or, to the best of the
knowledge of such Supporting Party, threatened against such Supporting Party or any of its Affiliates that challenges or would challenge the execution and delivery of this Agreement or the taking of any of the actions required to be taken by such
Supporting Party under this Agreement. 
 8.    Representations and Warranties of Parent. Parent hereby
represents and warrants to the other parties hereto as follows: 
 (a)    Authorization, etc. Parent has
all necessary corporate power and authority to execute and deliver this Agreement and to perform its obligations hereunder. This Agreement has been duly executed and delivered by Parent and constitutes a legal, valid and binding obligation of Parent
enforceable against Parent in accordance with its terms, subject only to: (i) laws of 

  
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general application relating to bankruptcy, insolvency and the relief of debtors; and (ii) rules of law governing specific performance, injunctive relief and other equitable remedies. Parent
hereby further represents and warrants that: (A) Parent is duly organized, validly existing and in good standing under the laws of the State of Delaware; (B) the undersigned has the power to execute and deliver this Agreement on behalf of
Parent; (C) Parent has taken all necessary action to authorize the execution, delivery and performance of this Agreement; and (D) the execution, delivery and performance of this Agreement by Parent will not violate any provision of
Parent’s Governing Documents. 
 (b)    No Conflicts or Consents. The execution and delivery of this
Agreement by Parent do not, and the performance of this Agreement by Parent will not: (i) conflict with or violate any Legal Requirement or Order applicable to Parent or by which Parent or any of its assets is or may be bound or affected; or
(ii) result in or constitute (with or without notice or lapse of time) any breach of or default under, or give to any other Person (with or without notice or lapse of time) any right of termination, amendment, acceleration or cancellation of
any Contract to which Parent is a party or by which Parent or any of its Affiliates or assets is or may be bound or affected. The execution and delivery of this Agreement by Parent do not, and the performance of this Agreement by Parent will not,
require any Consent of any Person. 
 (c)    Litigation. There is no Legal Proceeding by or before any
Governmental Entity pending or, to the best of the knowledge of Parent, threatened against Parent or any of its Affiliates that challenges or would challenge the execution and delivery of this Agreement or the taking of any of the actions required
to be taken by Parent under this Agreement. 
 9.    Representations and Warranties of the Company. The Company
hereby represents and warrants to the other parties hereto as follows: 
 (a)    Authorization, etc. The
Company has all necessary corporate power and authority to execute and deliver this Agreement and to perform its obligations hereunder. This Agreement has been duly executed and delivered by the Company and constitutes a legal, valid and binding
obligation of the Company enforceable against the Company in accordance with its terms, subject only to: (i) laws of general application relating to bankruptcy, insolvency and the relief of debtors; and (ii) rules of law governing specific
performance, injunctive relief and other equitable remedies. The Company hereby further represents and warrants that: (A) the Company is duly organized, validly existing and in good standing under the laws of the State of Delaware; (B) the
undersigned has the power to execute and deliver this Agreement on behalf of the Company; (C) the Company has taken all necessary action to authorize the execution, delivery and performance of this Agreement; and (D) the execution,
delivery and performance of this Agreement by the Company will not violate any provision of the Company’s Governing Documents. 

(b)    No Conflicts or Consents. The execution and delivery of this Agreement by the Company do not, and the
performance of this Agreement by the Company will not: (i) conflict with or violate any Legal Requirement or Order applicable to the Company or by which the Company or any of its assets is or may be bound or affected; or (ii) result in or
constitute (with or without notice or lapse of time) any breach of or default under, or give to any other Person (with or without notice or lapse of time) any right of termination, amendment, acceleration or


  
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cancellation of any Contract to which the Company is a party or by which the Company or any of its Affiliates or assets is or may be bound or affected. The execution and delivery of this
Agreement by the Company do not, and the performance of this Agreement by the Company will not, require any Consent of any Person. 

(c)    Litigation. There is no Legal Proceeding by or before any Governmental Entity pending or, to the best of the
Knowledge of the Company, threatened against the Company or any of its Affiliates that challenges or would challenge the execution and delivery of this Agreement or the taking of any of the actions required to be taken by the Company under this
Agreement. 
 10.    No Solicitation. 

(a)    During the period from the date of this Agreement and continuing until the termination of this Agreement in
accordance with Section 10, no Supporting Party shall, and each Supporting Party shall cause or direct, as applicable, its Affiliates and Representatives not to, directly or indirectly: (i) solicit, initiate, enter
into or continue discussions, negotiations or transactions with, or encourage or respond to any inquiries or proposals by, or provide any information to, any Person (other than the Company and its Representatives) concerning any merger, sale of
ownership interests and/or assets of Parent, recapitalization or similar transaction or any other “Business Combination” (as defined in the Parent Charter), in each case other than the Transactions (each, a “Parent Business
Combination”); (ii) enter into any agreement regarding, continue or otherwise participate in any discussions or negotiations regarding, or cooperate in any way that would otherwise reasonably be expected to lead to a Parent Business
Combination; or (iii) commence, continue or renew any due diligence investigation regarding a Parent Business Combination. Each Supporting Party shall, and shall cause its respective Affiliates and Representatives to, immediately cease any and
all existing discussions or negotiations with any Person (other than the Company and its Representatives) with respect to any Parent Business Combination. Each Supporting Party agrees to promptly inform such Person’s Representatives of the
obligations undertaken in this Section 10(a). 
 (b)    Each Supporting Party shall promptly
(and in no event later than 24 hours after becoming aware of such inquiry, proposal, offer or submission) notify the other parties hereto if it or, to the best of its knowledge, any of its or its Representatives receives any inquiry, proposal, offer
or submission with respect to a Parent Business Combination (including the identity of the Person making such inquiry or submitting such proposal, offer or submission), after the execution and delivery of this Agreement. If any Supporting Party or
its Representatives receives an inquiry, proposal, offer or submission with respect to a Parent Business Combination, such Supporting Party shall provide the other parties hereto with a copy of such inquiry, proposal, offer or submission. 

11.    Termination. This Agreement shall terminate, and no party shall have any rights or obligations hereunder and
this Agreement shall have no further effect upon the Expiration Time. No such termination, however, shall relieve any party hereto of any liability or damages to the other party hereto resulting from any deliberate breach of this Agreement prior to
its termination. 

  
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 12.    Capacity; Publicity. 

(a)    Notwithstanding anything in this Agreement to the contrary, but without limitation of any obligations under the
Merger Agreement, each Supporting Party is entering into this Agreement solely in its capacity as a record holder or beneficial owner of shares of Subject Securities and not in its (or any Affiliate’s) capacity as an officer or director of
Parent or its subsidiaries, if applicable. Notwithstanding any asserted conflict, nothing herein will limit or affect any Supporting Party’s ability to act as an officer or director of Parent or its Subsidiaries. 

(b)    No Supporting Party nor any of such Supporting Party’s Affiliates shall issue or make any press release or
other public announcement concerning (or otherwise disclose to any Person the existence or terms of) this Agreement, the Merger Agreement or any of the Transactions, without Parent’s and the Company’s prior written consent. 

13.    Miscellaneous. 

(a)    Further Assurances. From time to time and without additional consideration, Supporting Party shall use its
reasonable best efforts to execute and deliver, or cause to be executed and delivered, such additional transfers, assignments, endorsements, Consents and other instruments (including the Surrender Documentation), and shall take such further actions,
as Parent may reasonably request for the purpose of carrying out and furthering the intent of this Agreement and the Merger Agreement. 

(b)    Notices. All notices and other communications hereunder shall be in writing and shall be deemed given:
(i) on the date established by the sender as having been delivered personally; (ii) one (1) Business Day after being sent by a nationally recognized overnight courier guaranteeing overnight delivery; (iii) on the date delivered,
if delivered by email of a pdf document; or (iv) on the fifth (5th) Business Day after the date mailed, by certified or registered mail, return receipt requested, postage prepaid. Such
communications, to be valid, must be addressed as follows: 
 if to Parent, to: 

Crescent Acquisition Corp 

11100 Santa Monica Blvd., Suite 2000 

Los Angeles, CA 90025 

Attention:        George Hawley 

Email:              george.hawley@crescentcap.com 

with a copy (which shall not constitute notice) to: 

Skadden, Arps, Slate, Meagher & Flom LLP 

525 University Avenue, Suite #1400 

Palo Alto, CA 94301 

Attention:        Michael J. Mies 

Email:              michael.mies@skadden.com 

  
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 if to the Company, to: 

LiveVox, Inc. 
 450 Sansome
Street, 9th Floor 
 San Francisco CA 94111 

Attention:        Mark Mallah 

E-mail:            MMallah@livevox.com

 and to: 
 Golden Gate
Private Equity, Inc. 
 One Embarcadero Center, Suite 3900 

San Francisco, CA 94111 

Attention: Stephen D. Oetgen and Rishi Chandna 

E-mail:        rchandna@goldengatecap.com 

     soetgen@goldengatecap.com 

with copies (which shall not constitute notice) to: 

Kirkland & Ellis LLP 

555 California Street, Suite 2900 

San Francisco, CA 94104 

Attention: Jeremy M. Veit, P.C.; James W. Beach 

Facsimile: (415) 453-1500 

E-mail:         jeremy.veit@kirkland.com 

      james.beach@kirkland.com 

if to a Supporting Party, to the address or email address of such Person set forth next to the name of such Person on
Schedule A. 
 or to such other address or to the attention of such Person or Persons as the recipient party has specified by
prior written notice to the sending party (or in the case of counsel, to such other readily ascertainable business address as such counsel may hereafter maintain). If more than one method for sending notice as set forth above is used, the earliest
notice date established as set forth above shall control. 
 (c)    Severability. In the event that any term,
provision, covenant or restriction of this Agreement, or the application thereof, is held to be illegal, invalid or unenforceable under any present or future Legal Requirement: (i) such provision will be fully severable; (ii) this
Agreement will be construed and enforced as if such illegal, invalid or unenforceable provision had never comprised a part hereof; (iii) the remaining provisions of this Agreement will remain in full force and effect and will not be affected by
the illegal, invalid or unenforceable provision or by its severance herefrom; and (iv) in lieu of such illegal, invalid or unenforceable provision, there will be added automatically as a part of this Agreement a legal, valid and enforceable
provision as similar in terms of such illegal, invalid or unenforceable provision as may be possible. 

  
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 (d)    Entire Agreement. This Agreement, the Merger Agreement and
the other Transaction Agreements, if applicable, and any other documents and instruments and agreements among the parties hereto as contemplated by or referred to herein or therein, constitute the entire agreement between the parties hereto with
respect to the subject matter hereof and thereof and supersede all prior agreements and understandings between the parties with respect thereto. 

(e)    Amendment. This Agreement may be amended by the parties hereto at any time by execution of an instrument in
writing signed on behalf of each of the parties hereto. 
 (f)    Assignment; Binding Effect; No Third-Party
Rights. Neither this Agreement nor any of the rights, interests or obligations hereunder may be assigned or delegated by any party hereto, and any attempted or purported assignment or delegation of any of such interests or obligations shall be
null and void. Subject to the preceding sentence, this Agreement shall be binding upon each of the parties hereto, their respective heirs, estates, executors and personal representatives (if applicable) and their respective successors and assigns,
and shall inure to the benefit of each of the parties hereto and their respective successors and assigns. Nothing in this Agreement is intended to confer on any Person (other than Parent, the Company and the Supporting Parties and their respective
successors and assigns) any rights or remedies of any nature. Notwithstanding anything to the contrary herein (including the preceding sentence), the Stockholder Representative shall be an intended third party beneficiary of this Agreement. 

(g)    Other Remedies; Specific Performance. Except as otherwise provided herein, prior to the Closing, any
and all remedies herein expressly conferred upon a party hereto will be deemed cumulative with and not exclusive of any other remedy conferred hereby, or by law or equity upon such party hereto, and the exercise by a party hereto of any one remedy
will not preclude the exercise of any other remedy. The parties hereto agree that irreparable damage would occur in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise
breached. It is accordingly agreed that each party hereto shall be entitled to enforce specifically the terms and provisions of this Agreement in any court having jurisdiction pursuant to Section 13(i),
without the necessity of proving the inadequacy of money damages as a remedy and without bond or other security being required, this being in addition to any other remedy to which they are entitled at law or in equity. Each of the parties hereto
hereby acknowledges and agrees that it may be difficult to prove damages with reasonable certainty, that it may be difficult to procure suitable substitute performance, and that injunctive relief and/or specific performance will not cause an undue
hardship to the parties hereto. Each of the parties hereto hereby further acknowledges that the existence of any other remedy contemplated by this Agreement does not diminish the availability of specific performance of the obligations hereunder or
any other injunctive relief. Each party hereto hereby further agrees that in the event of any action by any other party for specific performance or injunctive relief, it will not assert that a remedy at law or other remedy would be adequate or that
specific performance or injunctive relief in respect of such breach or violation should not be available on the grounds that money damages are adequate or any other grounds. 

(h)    Governing Law. This Agreement and the consummation of the Transactions, and any action, suit, dispute,
controversy or claim arising out of this Agreement and the consummation of the Transactions, or the validity, interpretation, breach or termination of this Agreement and the consummation of the Transactions, shall be governed by and construed in
accordance with the internal law of the State of Delaware regardless of the law that might otherwise govern under applicable principles of conflicts of law thereof. 

  
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 (i)    Consent to Jurisdiction; Waiver of Jury Trial. 

(i)    Each of the parties hereto irrevocably consents to the exclusive jurisdiction and venue of the Court of Chancery in
the State of Delaware (or, to the extent that such court does not have subject matter jurisdiction, the Superior Court of the State of Delaware and the United States District Court for the District of Delaware), in each case in connection with any
matter based upon or arising out of this Agreement, the other Transaction Agreements and the consummation of the Transactions, agrees that process may be served upon them in any manner authorized by the laws of the State of Delaware for such Person
and waives and covenants not to assert or plead any objection which they might otherwise have to such manner of service of process. Each party hereto and any Person asserting rights as a third-party beneficiary may do so only if he, she or it hereby
waives, and shall not assert as a defense in any legal dispute, that: (A) such Person is not personally subject to the jurisdiction of the above named courts for any reason; (B) such Legal Proceeding may not be brought or is not
maintainable in such court; (C) such Person’s property is exempt or immune from execution; (D) such Legal Proceeding is brought in an inconvenient forum; or (E) the venue of such Legal Proceeding is improper. Each party hereto
and any Person asserting rights as a third-party beneficiary hereby agrees not to commence or prosecute any such action, claim, cause of action or suit other than before one of the above-named courts, nor to make any motion or take any other action
seeking or intending to cause the transfer or removal of any such action, claim, cause of action or suit to any court other than one of the above-named courts, whether on the grounds of inconvenient forum or otherwise. Each party hereto hereby
consents to service of process in any such proceeding in any manner permitted by Delaware law, and further consents to service of process by nationally recognized overnight courier service guaranteeing overnight delivery, or by registered or
certified mail, return receipt requested, at its address specified pursuant to Section 13(b). Notwithstanding the foregoing in this Section 13(i), any party hereto may commence any
action, claim, cause of action or suit in a court other than the above-named courts solely for the purpose of enforcing an order or judgment issued by one of the above-named courts. 

(ii)    TO THE EXTENT NOT PROHIBITED BY APPLICABLE LAW WHICH CANNOT BE WAIVED, EACH OF THE PARTIES HERETO AND ANY PERSON
ASSERTING RIGHTS AS A THIRD-PARTY BENEFICIARY MAY DO SO ONLY IF HE, SHE OR IT IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT TO TRIAL BY JURY ON ANY CLAIMS OR COUNTERCLAIMS ASSERTED IN ANY LEGAL DISPUTE RELATING TO THIS AGREEMENT, EACH OF THE
OTHER TRANSACTION AGREEMENTS AND THE CONSUMMATION OF THE TRANSACTIONS, AND FOR ANY COUNTERCLAIM RELATING THERETO, IN EACH CASE WHETHER NOW EXISTING OR HEREAFTER ARISING. IF THE SUBJECT MATTER OF ANY SUCH LEGAL DISPUTE IS ONE IN WHICH THE WAIVER OF
JURY TRIAL IS PROHIBITED, NO PARTY HERETO NOR ANY PERSON ASSERTING RIGHTS AS A THIRD-PARTY BENEFICIARY SHALL ASSERT IN SUCH LEGAL DISPUTE A NON-COMPULSORY COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS
AGREEMENT, THE OTHER TRANSACTION AGREEMENTS AND THE CONSUMMATION OF THE TRANSACTIONS. FURTHERMORE, NO PARTY HERETO NOR ANY PERSON ASSERTING RIGHTS AS A 

  
 13 













 
THIRD-PARTY BENEFICIARY SHALL SEEK TO CONSOLIDATE ANY SUCH LEGAL DISPUTE WITH A SEPARATE ACTION OR OTHER LEGAL PROCEEDING IN WHICH A JURY TRIAL CANNOT BE WAIVED. 

(j)    Counterparts; Electronic Delivery. This Agreement may be executed in one or more counterparts, all of which
shall be considered one and the same document and shall become effective when one or more counterparts have been signed by each of the parties hereto and delivered to the other parties hereto, it being understood that all parties hereto need not
sign the same counterpart. Delivery by electronic transmission to counsel for the other parties hereto of a counterpart executed by a party hereto shall be deemed to meet the requirements of the previous sentence. 

(k)    Headings. The headings used in this Agreement have been inserted for convenience of reference only and do
not define or limit the provisions hereof. 
 (l)    Extension; Waiver. At any time prior to the Closing, Parent,
the Company and each Supporting Party may, to the extent not prohibited by Applicable Legal Requirements: (i) extend the time for the performance of any of the obligations or other acts of the other parties hereto; (ii) waive any
inaccuracies in the representations and warranties made to the other parties hereto contained herein or in any document delivered pursuant hereto; and (iii) waive compliance with any of the agreements or conditions for the benefit of such party
contained herein. Any agreement on the part of a party hereto to any such extension or waiver shall be valid only if set forth in an instrument in writing signed on behalf of such party. Delay in exercising any right under this Agreement shall not
constitute a waiver of such right. 
 (m)    Independence of Obligations. The covenants and obligations of each
Supporting Party set forth in this Agreement shall be construed as independent of any other Contract between such Supporting Party, on the one hand, and the Company or Parent, on the other hand. The existence of any claim or cause of action by any
such Supporting Party against the Company or Parent shall not constitute a defense to the enforcement of any of such covenants or obligations against such Supporting Party. Nothing in this Agreement shall limit any of the rights or remedies of
Parent or the Company under the Merger Agreement, or any of the rights or remedies of Parent or the Company or any of the obligations such Supporting Party under any agreement between such Supporting Party and Parent or the Company or any
certificate or instrument executed by such Supporting Party in favor of Parent or the Company; and nothing in the Merger Agreement or in any other such agreement, certificate or instrument, shall limit any of the rights or remedies of Parent or the
Company or any of the obligations of such Supporting Party under this Agreement. 
 (n)    No Presumption
Against Drafting Party. Each party hereto waives the application of any law, regulation, holding or rule of construction providing that ambiguities in an agreement or other document will be construed against the party drafting such
agreement or document. 
 (o)    Interpretation. The words “hereof,” “herein,”
“hereinafter,” “hereunder,” and “hereto” and words of similar import refer to this Agreement as a whole and not to any particular section or subsection of this Agreement and reference to a particular section of this


  
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Agreement will include all subsections thereof, unless, in each case, the context otherwise requires. The definitions of the terms herein shall apply equally to the singular and plural forms of
the terms defined. Whenever the context shall require, any pronoun shall include the corresponding masculine, feminine and neuter forms. When a reference is made in this Agreement to an Exhibit or Schedule, such reference shall be to an Exhibit or
Schedule to this Agreement unless otherwise indicated. When a reference is made in this Agreement to Sections or subsections, such reference shall be to a Section or subsection of this Agreement. Unless otherwise indicated the words
“include,” “includes” and “including” when used herein shall be deemed in each case to be followed by the words “without limitation.” Reference to the subsidiaries of an entity shall be deemed to include all
direct and indirect subsidiaries of such entity. The word “or” shall be disjunctive but not exclusive. References to a particular statute or regulation including all rules and regulations thereunder and any predecessor or successor
statute, rule, or regulation, in each case as amended or otherwise modified from time to time. All references to currency amounts in this Agreement shall mean United States dollars. 

The remainder of this page is intentionally left blank. 

  
 15 













 IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the
date first above written. 
  

					
	SPONSOR
	
	CFI SPONSOR LLC
		
	By:	 	 /s/ Robert D. Beyer

		 	Name:	 	Robert D. Beyer
		 	Title:	 	Member



  
 SIGNATURE
PAGE TO SPONSOR SUPPORT AGREEMENT 













 IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the
date first above written. 
  

	
	SUPPORTING PARTY
	
	 /s/ Robert D. Beyer

	Robert D. Beyer



  
 SIGNATURE
PAGE TO SPONSOR SUPPORT AGREEMENT 













 IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the
date first above written. 
  

	
	SUPPORTING PARTY
	
	 /s/ Jean-Marc Chapus

	Jean-Marc Chapus



  
 SIGNATURE
PAGE TO SPONSOR SUPPORT AGREEMENT 













 IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the
date first above written. 
  

	
	SUPPORTING PARTY
	
	 /s/ Todd M. Purdy

	Todd M. Purdy



  
 SIGNATURE
PAGE TO SPONSOR SUPPORT AGREEMENT 













 IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the
date first above written. 
  

	
	SUPPORTING PARTY
	
	 /s/ Christopher G. Wright

	Christopher G. Wright



  
 SIGNATURE
PAGE TO SPONSOR SUPPORT AGREEMENT 













 IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the
date first above written. 
  

	
	SUPPORTING PARTY
	
	 /s/ George P. Hawley

	George P. Hawley



  
 SIGNATURE
PAGE TO SPONSOR SUPPORT AGREEMENT 













 IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the
date first above written. 
  

					
	CRESCENT ACQUISITION CORP
		
	By:	 	 /s/ Christopher G. Wright

		 	Name:	 	Christopher G. Wright
		 	Title:	 	President



  
 SIGNATURE
PAGE TO SPONSOR SUPPORT AGREEMENT 













 IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the
date first above written. 
  

					
	LIVEVOX HOLDINGS, INC.
		
	By:	 	 /s/ Louis Summe

		 	Name:	 	Louis Summe
		 	Title:	 	President



  
 SIGNATURE
PAGE TO SPONSOR SUPPORT AGREEMENT 













 SCHEDULE A1 

 

									
	 Name
	  	 Notice Address
	  	Class A Stock	  	Class F Stock	  	Warrants
	 CFI Sponsor LLC
	  	 11100 Santa Monica Blvd., Suite 2000
 Los
Angeles, CA 90025
 Attention: George Hawley
 Email:
george.hawley@crescentcap.com
	  	0	  	6,175,000	  	7,000,000
	 Robert D. Beyer
	  	 c/o CFI Sponsor LLC
 11100 Santa
Monica Blvd., Suite 2000
 Los Angeles, CA 90025
 Attention:
George Hawley
 Email: george.hawley@crescentcap.com
	  	0	  	6,175,000	  	7,000,000
	 Jean-Marc Chapus
	  	0	  	6,175,000	  	7,000,000
	 Todd M. Purdy
	  	0	  	6,175,000	  	7,000,000
	 Christopher G. Wright
	  	0	  	0	  	0
	 George P. Hawley
	  	0	  	0	  	0
		  	                    TOTAL:	  	0	  	6,175,000	  	7,000,000

  

	1	 Table does not include the shares of Parent Class A Stock underlying private placement warrants
beneficially held or to be beneficially held by the Supporting Parties because these securities are not exercisable within 60 days of the date hereof. Sponsor is the record holder of the 6,175,000 shares of Parent Class F Stock reported herein.
Crescent Capital GP, LLC, Beyer Family Interests LLC and TSJD Family LLC control the voting and investment decisions with respect to such Class F Shares held by Sponsor. Messrs. Attanasio and Chapus are managing members of Crescent Capital GP,
LLC. Mr. Beyer is a managing member of Beyer Family Interests LLC. Mr. Purdy is a managing member of TSJD Family LLC. As such, Messrs. Attanasio, Chapus, Beyer and Purdy may be deemed to have beneficial ownership of the shares of Parent
Class F Stock held by Sponsor.