SIP Configuration Guide, Cisco IOS Release 15M&T - Configuring SIP Message Timer and Response Features

Publisher

Cisco

URL

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/sip/configuration/15-mt/sip-config-15-mt-book/voi-sip-timer.html

Published

2014-11-25

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco copyright; no-redistribution; short excerpts and locators only

Source notes citing this source

• Cisco IOS SIP gateways by default map a received SIP 404 Not Found to PSTN cause 1 (unallocated number). in context
• Cisco IOS SIP gateways by default also map SIP 410 Gone, 485 Ambiguous and 604 Does Not Exist Anywhere to PSTN cause 1 (unallocated number). in context
• Cisco IOS SIP gateways by default map a received SIP 484 Address Incomplete to PSTN cause 28. in context
• Cisco IOS SIP gateways by default map PSTN cause codes 1, 2 and 3 to SIP 404 Not Found. in context
• Cisco IOS SIP gateways by default map PSTN cause 26 (non-selected user clearing) to SIP 404 Not Found and cause 22 (number changed) to 410 Gone. in context
• Cisco IOS SIP gateways by default map PSTN cause 28 (address incomplete) to SIP 484 Address Incomplete. in context
• Cisco IOS SIP gateways allow the default cause-to-SIP mappings to be overridden with the set sip-status and set pstn-cause commands. in context
• The cause a PSTN caller receives for a SIP 503 depends on the gateway: RFC 3398 recommends cause 38 but the Cisco IOS 15M&T default is cause 63, so gateway configuration should be checked before interpreting a release cause. inferred in context
• Cisco IOS SIP gateways let administrators override default cause mapping under sip-ua with set pstn-cause <cause> sip-status <status> and set sip-status <status> pstn-cause <cause>. in context
• The Cisco IOS 15M&T SIP guide describes adding the Reason header with the Q.850 cause to outgoing BYE and CANCEL requests and 4xx, 5xx and 6xx responses, so the original ISDN disconnect cause survives the SIP leg. in context
• In the Cisco IOS 15M&T default SIP-to-PSTN mapping, SIP 503 Service Unavailable maps to cause 63 (service or option not available). in context

Cite this source record

APA

WarmTransfer. (2014, November 25). SIP Configuration Guide, Cisco IOS Release 15M&T - Configuring SIP Message Timer and Response Features. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-ios-sip-config-15mt-timer-response

BibTeX

@misc{warmtransfer-cisco-ios-sip-config-15mt-timer-response,
  title  = {SIP Configuration Guide, Cisco IOS Release 15M&T - Configuring SIP Message Timer and Response Features},
  author = {{WarmTransfer}},
  year   = {2014},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-ios-sip-config-15mt-timer-response},
  note   = {Cisco, accessed 2026-09-24}
}