RFC 6337 notes that the sendonly hold model assumes the holding UA will play music on hold and that this is not always the case.

Checked 2026-09-24

This model is based on an assumption that the UA initiating the hold will want to play Music on Hold, which is not always the case.
Vendor
IETF
Product
SIP
Subsystem
hold
Deployment
any
Region
not restricted
Release range
RFC 6337 as published
Checked
2026-09-24

Sources

Cite this note

APA

WarmTransfer. (2026, September 24). Hold resume and conference signaling: source note hold-resume-conference-6337-moh-assumption. WarmTransfer. https://warmtransfer.net/knowledge/claims/hold-resume-conference-6337-moh-assumption

BibTeX

@misc{warmtransfer-claim-hold-resume-conference-6337-moh-assumption,
  title  = {Hold resume and conference signaling: source note hold-resume-conference-6337-moh-assumption},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/hold-resume-conference-6337-moh-assumption},
  note   = {Source note hold-resume-conference-6337-moh-assumption, checked 2026-09-24}
}

Read in context