Source note · Hold resume and conference signaling
RFC 3261 says a UAC receiving 491 to a re-INVITE waits a random 2.1 to 4 seconds before retrying if it owns the Call-ID and 0 to 2 seconds otherwise.
Checked 2026-09-24
- Vendor
- IETF
- Product
- SIP
- Subsystem
- re-INVITE glare
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3261 as published
- Checked
- 2026-09-24
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 14.1 UAC Behavior
Cite this note
APA
WarmTransfer. (2026, September 24). Hold resume and conference signaling: source note hold-resume-conference-3261-491-retry. WarmTransfer. https://warmtransfer.net/knowledge/claims/hold-resume-conference-3261-491-retry
BibTeX
@misc{warmtransfer-claim-hold-resume-conference-3261-491-retry,
title = {Hold resume and conference signaling: source note hold-resume-conference-3261-491-retry},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/hold-resume-conference-3261-491-retry},
note = {Source note hold-resume-conference-3261-491-retry, checked 2026-09-24}
}