Source note · SIP 488 and codec negotiation failures
Unified CM invokes a transcoder when the endpoints in a call use different voice codecs, converting one codec stream into another such as G.711 to G.729.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- media resources
- 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 Media Resources — Cisco Systems · tier 2 current vendor documentation · Configure Media Resources - Transcoders
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 488 and codec negotiation failures: source note sip-488-codec-failures-cucm-transcoder-invoked. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-cucm-transcoder-invoked
BibTeX
@misc{warmtransfer-claim-sip-488-codec-failures-cucm-transcoder-invoked,
title = {SIP 488 and codec negotiation failures: source note sip-488-codec-failures-cucm-transcoder-invoked},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-cucm-transcoder-invoked},
note = {Source note sip-488-codec-failures-cucm-transcoder-invoked, checked 2026-09-25}
}