Source note · SIP OPTIONS pings and trunk keepalives
For Microsoft 365, Office 365 and GCC, Direct Routing's SIP connection points are sip.pstnhub.microsoft.com, sip2.pstnhub.microsoft.com and sip3.pstnhub.microsoft.com, and the SBC signals to the Microsoft SIP proxy over SIP/TLS on port 5061.
Checked 2026-09-24
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SIP signaling
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Plan Direct Routing — Microsoft (Microsoft Learn) · tier 2 current vendor documentation · sections 'SIP signaling: FQDNs' and 'SIP signaling ports'
Cite this note
APA
WarmTransfer. (2026, September 24). SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-dr-proxy-fqdns-port. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-options-keepalive-dr-proxy-fqdns-port
BibTeX
@misc{warmtransfer-claim-sip-options-keepalive-dr-proxy-fqdns-port,
title = {SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-dr-proxy-fqdns-port},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-options-keepalive-dr-proxy-fqdns-port},
note = {Source note sip-options-keepalive-dr-proxy-fqdns-port, checked 2026-09-24}
}