Source note · Troubleshooting calls that drop on hold or transfer
If no session refresh arrives, the side not performing refreshes should send BYE slightly before the session expires; the recommended margin is the smaller of 32 seconds and one third of the session interval.
Checked 2026-09-30
- Vendor
- IETF
- Product
- SIP
- Subsystem
- session-timer
- Deployment
- any
- Region
- not restricted
- Release range
- RFC as published
- Checked
- 2026-09-30
Sources
- RFC 4028: Session Timers in the Session Initiation Protocol (SIP) — IETF / RFC Editor · tier 1 standards and regulators · Section 10 (Performing Refreshes)
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-bye-before-expiry. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-bye-before-expiry
BibTeX
@misc{warmtransfer-claim-sip-reinvite-call-drops-bye-before-expiry,
title = {Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-bye-before-expiry},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-bye-before-expiry},
note = {Source note sip-reinvite-call-drops-bye-before-expiry, checked 2026-09-30}
}