Source note · SIP registration failures
In the RFC 3665 registration example the credentialed retry REGISTER keeps the same Call-ID as the challenged REGISTER and increments CSeq from 1 to 2.
Checked 2026-09-25
- Vendor
- not restricted
- Product
- SIP
- Subsystem
- registration
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3665
- Checked
- 2026-09-25
Sources
- RFC 3665: Session Initiation Protocol (SIP) Basic Call Flow Examples — RFC Editor / IETF · tier 1 standards and regulators · Section 2.1, messages F1 and F3 (Call-ID and CSeq header fields)
Cite this note
APA
WarmTransfer. (2026, September 25). SIP registration failures: source note sip-registration-failures-callid-cseq-retry. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-registration-failures-callid-cseq-retry
BibTeX
@misc{warmtransfer-claim-sip-registration-failures-callid-cseq-retry,
title = {SIP registration failures: source note sip-registration-failures-callid-cseq-retry},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-registration-failures-callid-cseq-retry},
note = {Source note sip-registration-failures-callid-cseq-retry, checked 2026-09-25}
}