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DOW Networks Supports - IP enabled PBX - H.323, MGCP  
Provider - Model VoIP Services Codex
Alcatel OmniPCX Enterprise VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
Alcatel OmniVista 4760 VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
Alcatel e-Reflexes IP phones VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
Asterisk 1.0.0 Open Source Linux PBX VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
Avaya S8700 Media Server VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
Avaya G650 Media Gateway VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
Nortel 1000M Release 3.0 VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
Nortel Networks Succession 1000M VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
Nortel Optivity Telephony Manager VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
Nortel Networks i2000 Series IP Phones VoIP toll free (1-800) ITFS UIFN H.323 G.711 G.729 MGCP
               
ITFS (International Toll Free Service) numbers are available from over 70 countries
UIFN (Universal International Freephone Numbers) numbers are available from 32 countries
MGCP (Media Gateway Control Protocol) 
Click here to read the PDF - "Large IP-PBXs: A Well-matched Quartet"

 


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