Source note · Troubleshooting calls that drop on hold or transfer
The Microsoft Direct Routing SIP proxy always offers the Session Timer on non-bypass calls, does not offer it on media bypass calls, and does not require the SBC to use it.
Checked 2026-09-30
The SIP proxy supports (always offers) the Session Timer on non-bypass calls but doesn't offer it on bypass calls.
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- session-timer
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-30
- Checked
- 2026-09-30
Sources
- Teams Phone System Direct Routing: SIP protocol — Microsoft · tier 2 current vendor documentation · Session timer
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-session-timer-offer. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-session-timer-offer
BibTeX
@misc{warmtransfer-claim-sip-reinvite-call-drops-dr-session-timer-offer,
title = {Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-session-timer-offer},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-session-timer-offer},
note = {Source note sip-reinvite-call-drops-dr-session-timer-offer, checked 2026-09-30}
}