Source note · Troubleshooting calls that drop on hold or transfer
The same Microsoft article states that the SBC must support INVITE with Replaces, and Microsoft's transfer troubleshooting page lists INVITE with a Replaces header as the second-preference transfer method.
disputed · Checked 2026-09-30
The SBC must support Invite with Replaces.
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- call-transfer
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-30
- Status
- disputed
- Checked
- 2026-09-30
Sources
- Teams Phone System Direct Routing: SIP protocol — Microsoft · tier 2 current vendor documentation · Replaces option
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-replaces-required. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-replaces-required
BibTeX
@misc{warmtransfer-claim-sip-reinvite-call-drops-dr-replaces-required,
title = {Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-replaces-required},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-replaces-required},
note = {Source note sip-reinvite-call-drops-dr-replaces-required, checked 2026-09-30}
}