Source note · Calls that drop after about 30 seconds
For in-dialog requests, the Direct Routing SIP proxy picks the next hop from the top Record-Route first. If there is no Record-Route, it uses the Contact header.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SIP proxy
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Teams Phone System Direct Routing: SIP protocol — Microsoft · tier 2 current vendor documentation · Section 'Contact and Record-Route headers considerations'
Cite this note
APA
WarmTransfer. (2026, September 25). Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-msdr-next-hop. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-msdr-next-hop
BibTeX
@misc{warmtransfer-claim-sip-calls-drop-30-seconds-msdr-next-hop,
title = {Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-msdr-next-hop},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-msdr-next-hop},
note = {Source note sip-calls-drop-30-seconds-msdr-next-hop, checked 2026-09-25}
}