Source note · SIP OPTIONS pings and trunk keepalives
When Direct Routing receives OPTIONS from an SBC, it starts sending its own OPTIONS to the SBC FQDN given in the Contact header of those incoming OPTIONS.
Checked 2026-09-24
When Direct Routing sees incoming OPTIONS, it starts sending outgoing SIP Options messages to the SBC FQDN configured in the Contact header field in the incoming OPTIONS message.
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SBC pairing
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Connect your Session Border Controller (SBC) to Direct Routing — Microsoft · tier 2 current vendor documentation · section 'Verify the SBC connection' > 'Validate SIP options'
Cite this note
APA
WarmTransfer. (2026, September 24). SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-dr-proxy-options-contact. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-options-keepalive-dr-proxy-options-contact
BibTeX
@misc{warmtransfer-claim-sip-options-keepalive-dr-proxy-options-contact,
title = {SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-dr-proxy-options-contact},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-options-keepalive-dr-proxy-options-contact},
note = {Source note sip-options-keepalive-dr-proxy-options-contact, checked 2026-09-24}
}