Iirc, TCP is mandatory, but I can say that many phones don't do it. For more details on UDP-To-TCP specs, you may ask on IETF SIP Core group or SIP Implementors mailing lists.

I labeled it feature request because it is not a bug in the existing C code per se, but something missing as an implementation.

After all there are many IETF RFCs that are not implemented in Kamailio, lack of having them is not a bug, but missing features. We work based on community collaboration, usually who needs a feature implements it and makes PRs to get it merge or helps to implement it (e.g., collaborates with other developers).

We also close the feature requests that don't get interest from developers, because the tracker is open for everyone to submit and it will get filled with requests which will make it hard to focus on actual issues after a while.


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