you might be of help on our concern please see below:
One of our clients is experiencing a one-way audio issue after 15 minutes of a call session. The client is using Avaya, which is peered with our ProSBC+.
Based on the SIP flow analysis, we observed that Avaya sends a re-INVITE at the 14-15-minute mark. It appears that this re-INVITE coincides with the occurrence of the one-way audio issue.
May we kindly ask if there is a configuration or setting in ProSBC+ that could help address or resolve this concern?
This issue is often related to how SIP Session Timers are handled by either the endpoints, any SIP proxy, or another device in the call path. When Session Timer support is incomplete or inconsistent across devices, it can lead to one-way audio, especially after a re-INVITE (as seen around the 15-minute mark in your scenario).
Recommended steps:
If no device in the call path requires Session Timers:
Consider disabling Session Timers globally. You can do this in the SIP menu under Session Timers by unchecking the “Use session timer” option.
If you need to keep Session Timers enabled, or for further testing:
Try enabling the flag “Support reinvite no role change”. This can help with scenarios where the re-INVITE causes a media negotiation issue.
Both of these settings can help resolve issues caused by mismatched Session Timer support and are commonly used troubleshooting steps for one-way audio problems related to SIP re-INVITEs.
Let me know if you need more specific steps for your SBC platform, or if you’d like to share the SIP call flow for a more detailed analysis.