fix: reject codec-changing re-INVITE with 488 - #767
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When an in-dialog re-INVITE offers SDP that no longer includes the currently negotiated audio codec/payload type, answer 488 Not Acceptable Here and leave the RTP destination unchanged. Previously LiveKit returned 200 OK with the cached local SDP, which could advertise a codec that was not in the offer (RFC 3264 §6.1) and leave the call with no usable media. Address-only re-INVITEs that keep the negotiated codec continue to update the RTP destination as before. Adds inbound/outbound regression coverage for codec mismatch. Fixes livekit#766 Co-authored-by: li xuanqun <793005378@qq.com>
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #767 +/- ##
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+ Coverage 65.25% 66.19% +0.93%
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Files 51 41 -10
Lines 6588 7981 +1393
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+ Hits 4299 5283 +984
- Misses 1915 2214 +299
- Partials 374 484 +110 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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When an in-dialog re-INVITE offers SDP that no longer includes the currently negotiated audio codec/payload type, answer 488 Not Acceptable Here and leave the RTP destination unchanged.
Previously LiveKit returned 200 OK with the cached local SDP, which could advertise a codec that was not in the offer (RFC 3264 §6.1) and leave the call with no usable media. Address-only re-INVITEs that keep the negotiated codec continue to update the RTP destination as before.
Adds inbound/outbound regression coverage for codec mismatch.
Fixes #766