The Release 15 guide lists use of the G.729a codec for music as a cause of a user not hearing acceptable Music On Hold, because G.729a is designed for human speech.
Checked 2026-09-30
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- music-on-hold
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Release 15 and SUs as of 2026-09-30
- Checked
- 2026-09-30
Sources
- Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Music On Hold — Cisco Systems · tier 2 current vendor documentation · sections 'Music On Hold Restrictions' (Unacceptable Audio Quality with G.729a codec) and 'Music On Hold Troubleshooting'
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting Unified CM media resource allocation failures: source note cucm-media-resource-failures-moh-g729a-quality. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-media-resource-failures-moh-g729a-quality
BibTeX
@misc{warmtransfer-claim-cucm-media-resource-failures-moh-g729a-quality,
title = {Troubleshooting Unified CM media resource allocation failures: source note cucm-media-resource-failures-moh-g729a-quality},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-media-resource-failures-moh-g729a-quality},
note = {Source note cucm-media-resource-failures-moh-g729a-quality, checked 2026-09-30}
}