Document:

TENTH AMENDMENT

 Pages where confidential treatment has been requested are stamped “Confidential
Treatment Requested and the Redacted Material has been separately filed with the Commission,” and places where information has been redacted have been marked with (***). 

EXHIBIT 10.21F 
 TENTH AMENDMENT 
 TO THE 

RESTATED AND AMENDED 
 CSG MASTER SUBSCRIBER MANAGEMENT SYSTEM AGREEMENT 
 BETWEEN

 CSG SYSTEMS, INC. 
 AND 
 COMCAST CABLE COMMUNICATIONS MANAGEMENT, LLC 

THIS TENTH AMENDMENT (the “Amendment”) is made by and between CSG Systems, Inc. (“CSG”) and Comcast Cable
Communications Management, LLC (“Customer”). The Effective Date of this Amendment is the date last signed below. CSG and Customer entered into a certain Restated and Amended CSG Master Subscriber Management System Agreement (CSG
document #2296663) dated July 1, 2008 (the “Agreement”) and now desire to amend the Agreement in accordance with the terms and conditions set forth in this Amendment. If the terms and conditions set forth in this Amendment shall be in
conflict with the Agreement, the terms and conditions of this Amendment shall control. Any terms in initial capital letters or all capital letters used as a defined term but not defined in this Amendment shall have the meaning set forth in the
Agreement. Upon execution of this Amendment by the parties, any subsequent reference to the Agreement between the parties shall mean the Agreement as amended by this Amendment. Except as amended by this Amendment, the terms and conditions set forth
in the Agreement shall continue in full force and effect according to their terms. 
 CSG and Customer agree to the following as of the
Effective Date: 
  

	1.	Customer desires to utilize the services of CSG’s Professional Services Group to design, develop, and implement a custom solution that will allow
Customer’s Customer Service Representatives (CSRs) to complete orders with higher accuracy. CSG will design, develop and implement its Order Account Audit Tool (OAAT) to accomplish this solution by providing a series of edits during the
order creation process by CSRs that notify the CSR if the order has violated an order audit rule. Consequently, Schedule F of the Agreement is amended to include the following fees for the CSG services to be performed in connection with
the design, development and implementation of its OAAT: 

  

					
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 IN WITNESS WHEREOF the parties hereto have caused this Amendment to be executed
by their duly authorized representatives. 
  

									
	COMCAST CABLE COMMUNICATIONS MANAGEMENT, LLC (“CUSTOMER”)	 		 	CSG SYSTEMS, INC. (“CSG”)
					
	By:	 	/s/ Andrew J. Baer	 		 	By:	 	/s/ Joseph T. Ruble
	Name:	 	Andrew J. Baer	 		 	Name:	 	Joseph T. Ruble
	Title:	 	SVP & CIO	 		 	Title:	 	EVP, CAO & General Counsel
	Date:	 	11/16/11	 		 	Date:	 	11-29-11ELEVENTH AMENDMENT

 Pages where confidential treatment has been requested are stamped “Confidential
Treatment Requested and the Redacted Material has been separately filed with the Commission,” and places where information has been redacted have been marked with (***). 

EXHIBIT 10.21G 
 ELEVENTH AMENDMENT 
 TO THE 

RESTATED AND AMENDED 
 CSG MASTER SUBSCRIBER MANAGEMENT SYSTEM AGREEMENT 
 BETWEEN

 CSG SYSTEMS, INC. 
 AND 
 COMCAST CABLE COMMUNICATIONS MANAGEMENT, LLC 

This ELEVENTH AMENDMENT (the “Amendment”) is made by and between CSG Systems, Inc. (“CSG”) and Comcast Cable
Communications Management, LLC (“Customer”). The Effective Date of this Amendment is the date last signed below. CSG and Customer entered into a certain Restated and Amended CSG Master Subscriber Management System Agreement (CSG
document #2296663) dated July 1, 2008 (the “Agreement”) and now desire to amend the Agreement in accordance with the terms and conditions set forth in this Amendment. If the terms and conditions set forth in this Amendment shall be in
conflict with the Agreement, the terms and conditions of this Amendment shall control. Any terms in initial capital letters or all capital letters used as a defined term but not defined in this Amendment shall have the meaning set forth in the
Agreement. Upon execution of this Amendment by the parties, any subsequent reference to the Agreement between the parties shall mean the Agreement as amended by this Amendment. Except as amended by this Amendment, the terms and conditions set forth
in the Agreement shall continue in full force and effect according to their terms. 
 CSG and Customer agree to the following:

  

	1.	Customer desires to utilize, and CSG agrees to deliver CSG’s Event Management Service, which allows custom business rules to be developed to enhance the
Precision eMail. 

  

	2.	Therefore, Schedule C of the Agreement, entitled “RECURRING SERVICES,” shall be amended to add the following to the list of Recurring Services:

 CSG’s Event Management 
  

	3.	Schedule C shall be further amended by adding the Service description for CSG’s Event Management as Exhibit C-17, which is attached hereto and
incorporated herein by this reference. 

  

	2.	Schedule F, Fees, CSG Recurring Services, of the Agreement shall be amended to add a new Section VIII entitled “CSG’s Event Management,”
as follows: 

 CSG RECURRING SERVICES 

VIII. CSG’s Event Management 
  

					
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	***	Confidential Treatment Requested and the Redacted Material has been separately filed with the Commission. 

 

	4.	Customer will use commercially reasonable efforts to keep its hardware and software in conformance with the Designated Environment specifications that CSG may
provide from time to time. If the Customer is not utilizing the product in a certified Designated Environment or Customer has added third party applications, Customer shall be responsible for making all necessary modifications to such third party
applications to ensure they function properly with any updates or upgrades to the Service. Custom software modifications are not included in this Agreement, but may be added to the Agreement and priced by mutual agreement of the parties.

 IN WITNESS WHEREOF the parties hereto have caused this Amendment to be executed by their duly authorized
representatives. 
  

									
	COMCAST CABLE COMMUNICATIONS MANAGEMENT, LLC (“CUSTOMER”)	 		 	CSG SYSTEMS, INC. (“CSG”)
					
	By:	 	/s/ Andrew J. Baer	 		 	By:	 	/s/ Joseph T. Ruble
	Name:	 	Andrew J. Baer	 		 	Name:	 	Joseph T. Ruble
	Title:	 	SVP & CIO	 		 	Title:	 	EVP, CAO & General Counsel
	Date:	 	11/28/11	 		 	Date:	 	12-12-11

	***	Confidential Treatment Requested and the Redacted Material has been separately filed with the Commission. 

 

 Exhibit C-17 

CSG’s Event Management 
 CSG’s Event Management. CSG’s Event Management is comprised of CSG Interactivate which provides the basis for custom workflows and business rules to be developed as part of the
implementation project or follow-on projects to enhance messaging capabilities.

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