Source note · Calls that drop after about 30 seconds
Even at the RFC 4028 minimum interval of 90 seconds, a missed refresh ends the call at about 60 seconds (90 minus the smaller of 32 and 30 seconds). A standards-conformant session-timer failure therefore cannot, on its own, explain a drop at about 30 seconds. Session-timer drops usually appear at 15 or 30 minutes.
inferred · Checked 2026-09-25
- Vendor
- IETF
- Product
- SIP
- Subsystem
- troubleshooting
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 4028 conformant implementations
- 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 combined with Min-SE minimum (section 5)
Cite this note
APA
WarmTransfer. (2026, September 25). Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-session-timer-not-30s. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-session-timer-not-30s
BibTeX
@misc{warmtransfer-claim-sip-calls-drop-30-seconds-session-timer-not-30s,
title = {Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-session-timer-not-30s},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-session-timer-not-30s},
note = {Source note sip-calls-drop-30-seconds-session-timer-not-30s, checked 2026-09-25}
}