Source note · SIP transactions dialogs and call setup
The INVITE transaction timeout is 64 times the round trip time estimate whose default is 500 milliseconds giving 32 seconds.
Checked 2026-09-15
- Vendor
- IETF
- Product
- Session Initiation Protocol
- Subsystem
- transactions
- Deployment
- not restricted
- Region
- not restricted
- Release range
- current as of 2026-09-15
- Checked
- 2026-09-15
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · RFC 3261 section 17.1.1.2 and the timer table in appendix A
Cite this note
APA
WarmTransfer. (2026, September 15). SIP transactions dialogs and call setup: source note siptx-timeout-is-sixty-four-round-trips. WarmTransfer. https://warmtransfer.net/knowledge/claims/siptx-timeout-is-sixty-four-round-trips
BibTeX
@misc{warmtransfer-claim-siptx-timeout-is-sixty-four-round-trips,
title = {SIP transactions dialogs and call setup: source note siptx-timeout-is-sixty-four-round-trips},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/siptx-timeout-is-sixty-four-round-trips},
note = {Source note siptx-timeout-is-sixty-four-round-trips, checked 2026-09-15}
}