Source note · SIP call forwarding and routing loops

The IOS max-forwards command got a larger range and a higher default in release 12.3(8)T to comply with RFC 3261; it was first introduced in 12.1(3)T.

Checked 2026-09-25

Vendor: Cisco
Product: Cisco Unified Border Element
Subsystem: SIP user agent
Deployment: on-premises
Region: not restricted
Release range: 12.1(3)T onward
Checked: 2026-09-25

Sources

Cisco IOS Voice Command Reference - K through R - map q850-cause through mgcp package-capability (max-forwards) — Cisco Systems · tier 2 current vendor documentation · max-forwards command entry: Command History

Cite this note

APA

WarmTransfer. (2026, September 25). SIP call forwarding and routing loops: source note sip-forwarding-loops-ios-max-forwards-1238t. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-forwarding-loops-ios-max-forwards-1238t

BibTeX

@misc{warmtransfer-claim-sip-forwarding-loops-ios-max-forwards-1238t,
  title  = {SIP call forwarding and routing loops: source note sip-forwarding-loops-ios-max-forwards-1238t},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/sip-forwarding-loops-ios-max-forwards-1238t},
  note   = {Source note sip-forwarding-loops-ios-max-forwards-1238t, checked 2026-09-25}
}

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