Source note · Troubleshooting calls that drop on hold or transfer
RFC 6337 warns that unless a UA offers a=sendrecv when it has no hold of its own to maintain, calls can become stuck on hold, especially when a third-party call controller is involved.
Checked 2026-09-30
- Vendor
- IETF
- Product
- SIP
- Subsystem
- sdp-offer-answer
- Deployment
- any
- Region
- not restricted
- Release range
- RFC as published
- Checked
- 2026-09-30
Sources
- RFC 6337: Session Initiation Protocol (SIP) Usage of the Offer/Answer Model — IETF / RFC Editor · tier 1 standards and regulators · Section 5.3, concluding paragraph
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-stuck-on-hold-3pcc. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-stuck-on-hold-3pcc
BibTeX
@misc{warmtransfer-claim-sip-reinvite-call-drops-stuck-on-hold-3pcc,
title = {Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-stuck-on-hold-3pcc},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-stuck-on-hold-3pcc},
note = {Source note sip-reinvite-call-drops-stuck-on-hold-3pcc, checked 2026-09-30}
}