Source note · SIP call forwarding and routing loops
When forwarding a request, a SIP proxy decrements Max-Forwards by one, and if the request carries no Max-Forwards header field the proxy adds one with the value 70.
Checked 2026-09-25
- Vendor
- IETF
- Product
- SIP
- Subsystem
- proxy forwarding
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3261 (June 2002)
- Checked
- 2026-09-25
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 16.6 Request Forwarding, step 3 (Max-Forwards)
Cite this note
APA
WarmTransfer. (2026, September 25). SIP call forwarding and routing loops: source note sip-forwarding-loops-proxy-decrement-insert. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-forwarding-loops-proxy-decrement-insert
BibTeX
@misc{warmtransfer-claim-sip-forwarding-loops-proxy-decrement-insert,
title = {SIP call forwarding and routing loops: source note sip-forwarding-loops-proxy-decrement-insert},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-forwarding-loops-proxy-decrement-insert},
note = {Source note sip-forwarding-loops-proxy-decrement-insert, checked 2026-09-25}
}