Source note · Troubleshooting calls that drop on hold or transfer
Per Microsoft, refresher=uac means the party that sent the INVITE must send the refresh reinvite, refresher=uas means the party that received it must, and reinvites are usually sent at the halfway point of the session timer.
Checked 2026-09-30
- 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, Note
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-refresher-role. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-refresher-role
BibTeX
@misc{warmtransfer-claim-sip-reinvite-call-drops-dr-refresher-role,
title = {Troubleshooting calls that drop on hold or transfer: source note sip-reinvite-call-drops-dr-refresher-role},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-reinvite-call-drops-dr-refresher-role},
note = {Source note sip-reinvite-call-drops-dr-refresher-role, checked 2026-09-30}
}