Voice Scenario 2
The following ingress and egress policies are used for scenario 2.
| Ingress Policy | Egress Policy | ||
|---|---|---|---|
| allow-codecs | Video:no PCMU:force * PCMA:force | allow-codecs | * PCMA:no |
| add-codecs-on-egress | add-codecs-on-egress | iLBC G726-16 | |
| order-codecs | order-codecs | G726-16 * PCMU | |
| force-ptime | disabled | force-ptime | disabled |
| packetization-time | packetization-time | ||
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In the following diagram, a video m= line is offered. The ingress policy disables the video m= lines. With no enabled m= lines left, the call is rejected.
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In the following diagram, G729 and video are offered to the Oracle® Enterprise Session Border Controller. Ingress policy allows G729 and disables the video m= line. The egress policy adds iLBC and G726-16, and then orders the codecs according to the order-codecs parameter. The ptime is maintained between O0 and O2. Both added codecs are allocated dynamic payload types in the order they appear in their m= line. A disabled Video m= line is passed on to the answerer.
The SDP answer agreed to use iLBC, G729, and adds PCMU, and reorders them as stated. The disabled video m= line is maintained. At this point, the top codec in A1, iLBC is used and transcoded with the top codec in O1, G729.
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In the following diagram, G729 and video are offered to the Oracle® Enterprise Session Border Controller. Ingress policy allows G729 and disables the video m= line. The egress policy adds iLBC and G726-16, and then orders the codecs according to the order-codecs parameter. The ptime is maintained between O0 and O2. Both added codecs are allocated dynamic payload types in the order they appear in their m= line.
The SDP answer only wants to use PCMU and PCMA. The egress policy removes PCMA and passes only PCMU to the offerer. Because PCMU was in O1 and is now the only codec in A1, it is used, and no transcoding is used between the endpoints.
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In the following diagram, G726-16 and telephone-event are offered to the Oracle® Enterprise Session Border Controller. Ingress policy allows both codecs. The egress policy adds iLBC, and then orders the codecs according to the order-codecs parameter.
The SDP answer agreed to use all codecs, but reorders them with G726-16 in the top position. Because G726-16 is the top codec in A1, and it is also present in O1, it is used for this call without any transcoding.
