Source note · SIP trunk carrier turn-up and acceptance testing
Direct Routing starts sending its own OPTIONS only after it receives OPTIONS from the SBC, and sends them to the SBC FQDN in the Contact header of those incoming OPTIONS.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- keepalive
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Connect your Session Border Controller (SBC) to Direct Routing — Microsoft · tier 2 current vendor documentation · Verify the SBC connection > Validate SIP options
Cite this note
APA
WarmTransfer. (2026, September 25). SIP trunk carrier turn-up and acceptance testing: source note sip-trunk-carrier-turn-up-dr-options-contact. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-trunk-carrier-turn-up-dr-options-contact
BibTeX
@misc{warmtransfer-claim-sip-trunk-carrier-turn-up-dr-options-contact,
title = {SIP trunk carrier turn-up and acceptance testing: source note sip-trunk-carrier-turn-up-dr-options-contact},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-trunk-carrier-turn-up-dr-options-contact},
note = {Source note sip-trunk-carrier-turn-up-dr-options-contact, checked 2026-09-25}
}