Source note · Troubleshooting calls that drop on hold or transfer
Microsoft notes a session timer failure can sit elsewhere in the path, such as at a PSTN carrier, which sends BYE to the SBC; the SBC relays it and the SIP proxy ends the call, so the fix is to find the source of the BYE.
Checked 2026-09-30
To fix this issue, determine the source of the SIP BYE message, and then resolve the issue at the source.
- 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
- Issues that affect inbound Direct Routing calls — Microsoft · tier 2 current vendor documentation · Calls drop after several minutes > Resolution, second paragraph
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-bye-from-carrier. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-bye-from-carrier
BibTeX
@misc{warmtransfer-claim-sip-reinvite-call-drops-dr-bye-from-carrier,
title = {Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-bye-from-carrier},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-bye-from-carrier},
note = {Source note sip-reinvite-call-drops-dr-bye-from-carrier, checked 2026-09-30}
}