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In devices configured to process early media, early media from the call's destination can disrupt the call setup due to a delay in establishing the RTP connection, resulting in one-way audio.
Delaying the SDP's answer until the RTP is initiated from the call endpoint prevents one-way audio - specifically by delaying the SDP's 183 response. In the case of endpoints that cannot handle SDP and RTP in a variable sequence, the SBC on the calling endpoint can avoid these issues by accepting an SDP response only after the destination endpoint has begun streaming RTP packets.
This functionality is enabled with the delayed183SdpAnswer flag. Enable this flag to delay early media answers to the originating endpoint until RTP packets are detected from answering endpoints. Once the SBC detects RTP packets, it forwards the 183 SDP response toward the endpoints.
Command Syntax
% set addressContext <name> zone <name> sipTrunkGroup <name> signaling delay18xSdpAnswer <disabled | enabled>
Command Parameters
| Parameter | Description |
|---|---|
delay18xSdpAnswer | Enable this flag to introduce a short delay to the 18x response in an RTP negotiation.
|
Note
When you enable the delayed183SdpAnswer flag, you will also need to enable the monitorRtp flag to ensure that the SBC is configured to monitor for early media.
Overview
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