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SIP RFC 6432 Non-Compliance: CANCEL packet - Printable Version

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SIP RFC 6432 Non-Compliance: CANCEL packet - lukeescude - 04-06-2017 02:10 AM

The handsets are displaying a Missed Call even though a CANCEL packet "answered elsewhere" was sent to the phones.

This only occurs on PJSIP, not old SIP, because of the Reason Code header containing Q.850 (instead of just cause=200, it contains both)

According to RFC 6432 (https://tools.ietf.org/html/rfc6432 ) the presence of this header should not affect normal operation.

I have attached a screenshot of a PCAP of the q.850 header.

The desired outcome would be to NOT mark a Missed Call, in accordance with RFC 6432