Source note · DNS SRV and service discovery for SIP
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.
Checked 2026-09-24
If you manually add a port number to an FQDN, the CUBE performs an A-AAAA lookup instead of the SRV lookup.
- Vendor
- Cisco
- Product
- CUBE on IOS XE
- Subsystem
- DNS resolution
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.6 onwards
- Checked
- 2026-09-24
Sources
- Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - Configure and Troubleshoot DNS Resolution — Cisco Systems · tier 2 current vendor documentation · Configure and Troubleshoot DNS Resolution, Overview
Cite this note
APA
WarmTransfer. (2026, September 24). DNS SRV and service discovery for SIP: source note dns-srv-voice-cube-port-forces-a. WarmTransfer. https://warmtransfer.net/knowledge/claims/dns-srv-voice-cube-port-forces-a
BibTeX
@misc{warmtransfer-claim-dns-srv-voice-cube-port-forces-a,
title = {DNS SRV and service discovery for SIP: source note dns-srv-voice-cube-port-forces-a},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dns-srv-voice-cube-port-forces-a},
note = {Source note dns-srv-voice-cube-port-forces-a, checked 2026-09-24}
}