Source note · Troubleshooting calls that drop on hold or transfer
Microsoft's Direct Routing SIP protocol article states that Direct Routing rejects SIP requests that have Replaces headers and tells administrators to make sure the SBC is not using them.
disputed · Checked 2026-09-30
Direct Routing rejects SIP requests that have Replaces headers defined.
- 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 · Processing the incoming request: finding the tenant and user, Note, third bullet
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-replaces-rejected. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-replaces-rejected
BibTeX
@misc{warmtransfer-claim-sip-reinvite-call-drops-dr-replaces-rejected,
title = {Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-replaces-rejected},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-replaces-rejected},
note = {Source note sip-reinvite-call-drops-dr-replaces-rejected, checked 2026-09-30}
}