Source note · SIP 488 and codec negotiation failures
Unified CM picks a call leg's audio codec by taking the codecs both sides support, removing those above the region's maximum audio bit rate, and then choosing the most preferred remaining codec from the audio codec preference list.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- regions
- Deployment
- on-premises, dedicated-instance
- Region
- not restricted
- Release range
- 15 and SUs
- Checked
- 2026-09-25
Sources
- System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Core Settings for Device Pools — Cisco Systems · tier 2 current vendor documentation · Configure Core Settings for Device Pools - Regions / audio codec selection
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 488 and codec negotiation failures: source note sip-488-codec-failures-cucm-codec-selection. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-cucm-codec-selection
BibTeX
@misc{warmtransfer-claim-sip-488-codec-failures-cucm-codec-selection,
title = {SIP 488 and codec negotiation failures: source note sip-488-codec-failures-cucm-codec-selection},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-cucm-codec-selection},
note = {Source note sip-488-codec-failures-cucm-codec-selection, checked 2026-09-25}
}