Source note · Troubleshooting calls that drop on hold or transfer
A 481 or 408 response to a re-INVITE, unlike other non-2xx responses, leads the UAC to terminate the dialog.
Checked 2026-09-30
- Vendor
- IETF
- Product
- SIP
- Subsystem
- sip-dialog
- Deployment
- any
- Region
- not restricted
- Release range
- RFC as published
- Checked
- 2026-09-30
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 14.1 (UAC Behavior); see also Section 12.2.1.2
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-481-408-ends-dialog. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-481-408-ends-dialog
BibTeX
@misc{warmtransfer-claim-sip-reinvite-call-drops-481-408-ends-dialog,
title = {Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-481-408-ends-dialog},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-481-408-ends-dialog},
note = {Source note sip-reinvite-call-drops-481-408-ends-dialog, checked 2026-09-30}
}