Source note · SIP OPTIONS pings and trunk keepalives
Devices that support DNS names can use sip-all.pstnhub.microsoft.com, which resolves to all possible SIP proxy IP addresses.
Checked 2026-09-24
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SIP proxy
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- SBC connectivity issues — Microsoft · tier 2 current vendor documentation · section 'SBC status is intermittently inactive', Note under the three-FQDN list
Cite this note
APA
WarmTransfer. (2026, September 24). SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-dr-sip-all-fqdn. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-options-keepalive-dr-sip-all-fqdn
BibTeX
@misc{warmtransfer-claim-sip-options-keepalive-dr-sip-all-fqdn,
title = {SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-dr-sip-all-fqdn},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-options-keepalive-dr-sip-all-fqdn},
note = {Source note sip-options-keepalive-dr-sip-all-fqdn, checked 2026-09-24}
}