Transrating Scenario 1

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	PCMA
order-codecs	G723 *	order-codecs
force-ptime	disabled	force-ptime	enabled
packetization-time		packetization-time	40

1. In the following diagram, PCMU is offered in the ingress realm with 30ms ptime, and the egress realm is forced to use 40ms ptime. PCMA is added as the top codec for the egress realm.

   The Oracle® Enterprise Session Border Controller enables transcoding between the ingress realm (PCMU) and the egress realm (PCMA) and the ptimes as negotiated are also maintained.

   
2. In the following diagram, PCMU is offered in the ingress realm with a ptime of 30ms, and forced to 40 ms in the egress realm by policy.

   The answerer chooses to use PCMU with a 20 ms ptime. Thus the call is not transcoded, but it is transrated from 30ms in the ingress realm to 20ms in the egress realm.

   
3. In the following diagram, PCMU and G723 are offered in Realm A. The top codec’s ptime (30ms) is implied as the one for the ingress realm. The Oracle® Enterprise Session Border Controller adds PCMA to the SDP offer with a 40ms ptime.

   The answerer chooses to use PCMU with a 40 ms ptime. Thus the call is transrated from 30ms in the ingress realm to 40ms in the egress realm.