Source note · SIP 488 and codec negotiation failures
With voice-class codec transparent, CUBE passes only the offer unfiltered; it still filters SDP in the answer, and Cisco describes only the first codec of the offer list being included in the outbound message.
Checked 2026-09-25
Codec filtering is carried out on SDP content in ANSWER messages.
- Vendor
- Cisco
- Product
- CUBE
- Subsystem
- codec transparent
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.6 onwards
- Checked
- 2026-09-25
Sources
- Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - Introduction to Codecs — Cisco Systems · tier 2 current vendor documentation · Introduction to Codecs - Restrictions
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 488 and codec negotiation failures: source note sip-488-codec-failures-cube-codec-transparent. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-cube-codec-transparent
BibTeX
@misc{warmtransfer-claim-sip-488-codec-failures-cube-codec-transparent,
title = {SIP 488 and codec negotiation failures: source note sip-488-codec-failures-cube-codec-transparent},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-cube-codec-transparent},
note = {Source note sip-488-codec-failures-cube-codec-transparent, checked 2026-09-25}
}