Source note · Hold resume and conference signaling
The CUCM 12.0(1) SIP line messaging guide says the SIP line side supports hold both by RFC 2543 c=0 and by RFC 3261/3264 sendonly or inactive.
Checked 2026-09-24
Unified CM SIP line side supports simple media hold as per RFC 2543 (a.k.a. c = 0) or as per RFCs 3261 and 3264 (a = sendonly or a = inactive).
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- SIP line hold
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 12.0(1); later releases unverified
- Checked
- 2026-09-24
Sources
- SIP Line Messaging Guide (Standard Edition) for Cisco Unified Communications Manager - SIP Standard Line Interface — Cisco Systems · tier 2 current vendor documentation · Section Simple Hold and Resume
Cite this note
APA
WarmTransfer. (2026, September 24). Hold resume and conference signaling: source note hold-resume-conference-cucm-line-hold-methods. WarmTransfer. https://warmtransfer.net/knowledge/claims/hold-resume-conference-cucm-line-hold-methods
BibTeX
@misc{warmtransfer-claim-hold-resume-conference-cucm-line-hold-methods,
title = {Hold resume and conference signaling: source note hold-resume-conference-cucm-line-hold-methods},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/hold-resume-conference-cucm-line-hold-methods},
note = {Source note hold-resume-conference-cucm-line-hold-methods, checked 2026-09-24}
}