Source note · Troubleshooting calls that drop on hold or transfer
Signalling hold by setting the SDP connection address to 0.0.0.0 is the RFC 2543 method and is no longer recommended, because it prevents RTCP on held streams, does not work with IPv6 and breaks connection-oriented media.
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 3264 — An Offer/Answer Model with the Session Description Protocol (SDP) — IETF / RFC Editor · tier 1 standards and regulators · Section 8.4
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-zero-address-hold. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-zero-address-hold
BibTeX
@misc{warmtransfer-claim-sip-reinvite-call-drops-zero-address-hold,
title = {Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-zero-address-hold},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-zero-address-hold},
note = {Source note sip-reinvite-call-drops-zero-address-hold, checked 2026-09-30}
}