**Exhibit    10.48**
**PHOENIX      BUSINESS PARK**

**ASSIGNMENT      OF LEASE**

| 1.   | Recitals. |
|----------------|-----------|

| (a)   | Assignor,                as Lessee and Lessor executed and delivered a certain Lease Agreement                dated January 13, 2000 (the “Lease”), which Lease was amended by a First                Amendment to Lease Agreement dated February 17, 2000 and a Second                Amendment to Lease Agreement dated April 17,                2000. |
|-----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (b)   | Capitalization                terms used herein shall have the same meanings as in the                Lease. |
|-----------------|--------------------------------------------------------------------------------------------------------------|

| (c)   | Assignor                desires to assign the Lease to Assignee and Lessor has agreed to                consent                to such Assignment upon the terms and conditions                hereof. |
|-----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (a)   | For                and in consideration of ten and no/1000 dollars and other good and                valuable consideration, Assignor hereby assigns to Assignee all of                Assignor’s right, title and interest in and to the Lessee’s interest under                the Lease. Assignor agrees to indemnify, defend and hold Assignee                harmless                from and against all claims, losses, damages, costs and fees assessed                against Assignee in connection with the Lease for any time period                prior to                the effective date of this                Assignment. |
|-----------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (b)   | Assignee                accepts the foregoing Assignment and agrees to be bound by the terms                and                conditions of the Lease as if Assignee had been an original party                thereto.                Assignee will indemnify, defend and hold Assignor harmless from and                against all claims, losses, damages, costs and fees assessed against                Assignor in connection with the Lease for any time period from and                after                the Effective Date of this                Agreement. |
|-----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | Assignor: **LightNetworks.                Inc.**                                                                                                                                                                                                                                                                                                                                         |
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|   | By:                Jeffrey D. Smock_Title:                President & CEO  Assignee: **Network                Telephone Corporation**By:                Johney MatthewTitle:                EVP/ CFO   Lessor: **BSRT                Phoenix Business Park, L.L.C.**By:Robert                G. HigginsTitle:Vice                President   |

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