Source note · Calls that drop after about 30 seconds
RFC 6026 defines Timer M as 64*T1: the time an INVITE client transaction stays in the Accepted state, waiting for 2xx retransmissions or for further 2xx responses from other branches of a forked INVITE.
Checked 2026-09-25
- Vendor
- IETF
- Product
- SIP
- Subsystem
- timers
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 6026 and later
- Checked
- 2026-09-25
Sources
- RFC 6026: Correct Transaction Handling for 2xx Responses to Session Initiation Protocol (SIP) INVITE Requests — IETF / RFC Editor · tier 1 standards and regulators · Table 4 entry for Timer M; change to RFC 3261 section 17.1.1
Cite this note
APA
WarmTransfer. (2026, September 25). Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-timer-m. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-timer-m
BibTeX
@misc{warmtransfer-claim-sip-calls-drop-30-seconds-timer-m,
title = {Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-timer-m},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-timer-m},
note = {Source note sip-calls-drop-30-seconds-timer-m, checked 2026-09-25}
}