Tag : sip rfc

Invite + decreasing sequence number => 500 Error?

Posted April 16, 2012 by Pavel Espinal & filed under Asterisk Tips Comments: 0.

Tags: asterisk, linkedin, problem, SEQUENCE, sequence number, sequence numbers, sip, sip rfc, strange problem

Decrementing the CSeq header field value is directly in violation of RFC 3261. From section 22.2: When a UAC resubmits a request with its credentials after receiving a 401 (Unauthorized) or 407 (Proxy Authentication Required) response, it M..

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