PassFinder AP2520 VoIP Router/Gateway Operation Manual
Version 1.10 / Mar. 2002
AddPac Technology Co., Ltd.
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206
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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 AP2520.
Because the T.38 fax relay protocol is standards based, AP2520 can
interoperate with third-party T.38-enabled gateways and gatekeepers in a
mixed-vendor network when real-time fax relay capabilities are required.
Figure 5.9 shows an IP H.323 network with AP2520 routers and third-party
gateways and gatekeepers using T.38 fax relay functionality. By using T.38 fax
relay, all gateways and gatekeepers in this network are able to send faxes to
other remote offices or to the offices of another company on the IP network.
[Figure 5-9] 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
IP Network
Company A
Office 1
Company B
Office 1
Company B
Office 2
Company A
Office 2
Gatekeeper
Alternate
Gatekeeper
Third-party T.38
Gateway
AP2520 VoIP
Gateway
AP2520 VoIP
Gateway
Gateway
