FAX Scenario 2

The following ingress and egress policies are used for this FAX scenario.

Ingress Policy		Egress Policy
allow-codecs	*	allow-codecs	*
add-codecs-on-egress		add-codecs-on-egress	G711FB
order-codecs		order-codecs
force-ptime	disabled	force-ptime	disabled
packetization-time		packetization-time

1. In the following diagram, T.38 is offered to the Oracle® Enterprise Session Border Controller. A second m= line was added to O1 that included a G711FB codec (PCMU).

   The SDP answer agreed to PCMU, but disabled T.38. When the Oracle® Enterprise Session Border Controller forwarded the SDP in A1 to the answerer, it stripped the second m= line. Because A1 rejects T.38 m= line, but accepts the PCMU m= line, FAX transcoding is enabled.

   
2. In the following diagram, T.38 is offered to the Oracle® Enterprise Session Border Controller. A second m= line was added to O1 that included a G711FB codec (PCMU).

   The SDP answer agreed to PCMU and T.38. Because both O1 and A1 support T.38, the call proceeds without transcoding.