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"Pressing hold hangs up my AI call": the SIP fix

Quick answer: When a PSTN caller presses hold, their carrier sends an in-dialog re-INVITE offering a=sendonly . RFC 3264 §6.1 requires your answer to be recvonly or inactive . A stack that replays its cached a=sendrecv SDP sends an invalid answer, and in the packet capture attached to livekit/sip i…

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  1. 2026-09-22 15:02 · DEV Community — Machine Learning
    "Pressing hold hangs up my AI call": the SIP fix

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