Source note · SIP session timers
With Session-Expires 1800 and no refreshes, an RFC 4028 non-refresher following the recommended BYE margin would end the call about 32 seconds before 30 minutes, so drops clustered just under 30 minutes point to session timers.
inferred · Checked 2026-09-25
- Vendor
- IETF
- Product
- SIP
- Subsystem
- troubleshooting
- Deployment
- on-premises, multi-tenant, hybrid
- Region
- not restricted
- Release range
- RFC 4028
- Status
- inferred
- Checked
- 2026-09-25
Sources
- RFC 4028: Session Timers in the Session Initiation Protocol (SIP) — IETF / RFC Editor · tier 1 standards and regulators · Section 10 arithmetic applied to the Section 4 recommended value
Cite this note
APA
WarmTransfer. (2026, September 25). SIP session timers: source note sip-session-timers-drop-time-signature. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-session-timers-drop-time-signature
BibTeX
@misc{warmtransfer-claim-sip-session-timers-drop-time-signature,
title = {SIP session timers: source note sip-session-timers-drop-time-signature},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-session-timers-drop-time-signature},
note = {Source note sip-session-timers-drop-time-signature, checked 2026-09-25}
}