PHOENIX BUSINESS PARK ASSIGNMENT OF LEASE
                                                                                    Exhibit
    10.48
    
    
    
      
        
            
      1. 
      Recitals.
    
      
          
    
    
    
      
          
    
    
    
      
          
    
    
    
    
      
          
    
    
    
      
          
    
    
    
    
    
    
    
    
    
    
     
    
      
          
    
    
    
      
        
        
      
      
        
        
        
          
        
      
      
        
        
      
    
    
PHOENIX
      BUSINESS PARK
    
    LightNetworks,
      Inc. (“Assignor”) and Network Telephone Corporation (“Assignee”) and BSRT
      Phoenix Business Park, L.L.C. (“Lessor”) hereby agree as follows:
    | 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. | 
2. Assignment
      and Acceptance.
    | (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. | 
3. Consent. 
    Lessor
      hereby consents to the foregoing Assignment conditioned upon receipt by Lessor,
      on or prior to the effective date of this Agreement, of a letter of credit
      or
      cash deposit in the amount of $240,000.00 representing the replacement of the
      Irrevocable Letter of Credit required by Paragraph 5 of Exhibit “B” (Special
      Stipulations) of the Lease as amended by Paragraph 6 of the First Amendment
      to
      the Lease, which has been cashed by Lessor to cure a default by Lessee under
      the
      Lease.
    4. Effective
      Date.
    The
      Effective Date of this Assignment is September
      21, 2000.
    SIGNATURES
      ON FOLLOWING PAGE
    Executed
      this 21st
      day of
      September, 2000.
    | Assignor: LightNetworks.
                Inc. | |
| By:
                ▇▇▇▇▇▇▇ ▇. Smock_ Title:
                President & CEO Assignee: Network
                Telephone Corporation By:
                ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ Title:
                EVP/ CFO Lessor: BSRT
                Phoenix Business Park, L.L.C. By:▇▇▇▇▇▇
                ▇. ▇▇▇▇▇▇▇ Title:Vice
                President | 
EXHIBIT
      “B”
    Special
      Stipulations