Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - Configure and Troubleshoot DNS Resolution

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/configure-and-troubleshoot-dns-lookup-on-cube.html

Published

2026-04-25

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco documentation terms of use; no-redistribution; short excerpts and locators only

Source notes citing this source

• CUBE can hold local SRV records with the ip host command, for example ip host _sip._udp.cmgroup1.lab.local srv 1 50 5060 cucm1.lab.local (priority, weight, port, target). in context
• If a port number is added to the FQDN in a CUBE session target (for example dns:cisco.com:5060), CUBE performs an A/AAAA lookup instead of an SRV lookup. in context
• CUBE always attempts a DNS SRV lookup first for an FQDN session target and falls back to an A/AAAA lookup if the SRV lookup fails. in context
• CUBE's sip-ua srv version command selects between version 2, the default RFC 2782 underscore format, and version 1 for older systems that do not use the underscore. in context
• When CUBE resolves a host name while processing a SIP call, it uses only the VRF associated with that call for DNS resolution. in context

Cite this source record

APA

WarmTransfer. (2026, April 25). Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - Configure and Troubleshoot DNS Resolution. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cube-configure-dns-resolution

BibTeX

@misc{warmtransfer-cisco-cube-configure-dns-resolution,
  title  = {Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - Configure and Troubleshoot DNS Resolution},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cube-configure-dns-resolution},
  note   = {Cisco Systems, accessed 2026-09-24}
}