Source note · SIP registration failures
After a flow fails, RFC 5626 caps the wait before re-registering at W = min(max-time, base-time * 2^consecutive-failures), with max-time defaulting to 1800 s and base-time to 30 s if all flows failed or 90 s if at least one is still up.
Checked 2026-09-25
W = min (max-time, (base-time * (2 ^ consecutive-failures)))
- Vendor
- not restricted
- Product
- SIP
- Subsystem
- registration-recovery
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 5626
- Checked
- 2026-09-25
Sources
- RFC 5626: Managing Client-Initiated Connections in the Session Initiation Protocol (SIP) — IETF / RFC Editor · tier 1 standards and regulators · Section 4.5 Flow Recovery
Cite this note
APA
WarmTransfer. (2026, September 25). SIP registration failures: source note sip-registration-failures-outbound-backoff. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-registration-failures-outbound-backoff
BibTeX
@misc{warmtransfer-claim-sip-registration-failures-outbound-backoff,
title = {SIP registration failures: source note sip-registration-failures-outbound-backoff},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-registration-failures-outbound-backoff},
note = {Source note sip-registration-failures-outbound-backoff, checked 2026-09-25}
}