AddPac VoiceFinder AP2120 User's Guide Page 202

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VoiceFinder AP2120 VoIP Gateway User’s Guide Version 1.00
AddPac Technology Co., Ltd. -
202 -
5.5. Confuguring FAX Application
5.5.1. T.38 FAX Relay using VoIP H.323
The T.38 Fax Relay for VoIP H.323 feature provides standards-based fax relay
protocol support on the most of VoIP router or Gateway including AP2120.
For effective use of FAX Relay, change the configuration of other company’s
gateway to T.38, standard protocol.
The below figure shows IP H.323 network with T.38 FAX Relay using AP2120
gateway and gateway/gatekeepers from other companies. With T.38 FAX
Relay, gateways/gatekeepers of this network can send FAX to companies on
the other offices.
[Figure 5-6 IP Network for T.38 Fax Relay]
For example, when a fax is sent from the originating gateway, a voice call is
established. The terminating gateway detects the fax tone generated by the
answering fax machine. The VoIP H.323 call stack then starts a T.38 mode
request using H.245 procedures. If the opposite end of the call acknowledges
the T.38 mode request, the initial audio channel is closed and a T.38 fax relay
IP Network
C
ompany
A
Office 1
C
ompany
B
Office 1
C
ompany
B
Office 2
C
ompany
A
Office 2
Gatekeepe
r
Alternate
Gatekeeper
Third-party T.38
Gateway
AP2120 VoIP
Router
AP2120 VoIP
Router
Route
r
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