Source note · SIP OPTIONS pings and trunk keepalives
In RFC 3261, the timeout for a non-INVITE client transaction (Timer F) is 64*T1, and T1's default is 500 ms.
Checked 2026-09-24
- Vendor
- IETF
- Product
- SIP
- Subsystem
- transaction layer
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3261 (June 2002)
- Checked
- 2026-09-24
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 17.1.2.2 and Table 4 (Appendix A timer values); T1 in Section 17.1.1.1
Cite this note
APA
WarmTransfer. (2026, September 24). SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-rfc3261-timer-f. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-options-keepalive-rfc3261-timer-f
BibTeX
@misc{warmtransfer-claim-sip-options-keepalive-rfc3261-timer-f,
title = {SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-rfc3261-timer-f},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-options-keepalive-rfc3261-timer-f},
note = {Source note sip-options-keepalive-rfc3261-timer-f, checked 2026-09-24}
}