Source note · SIP OPTIONS pings and trunk keepalives
The Direct Routing FailoverResponseCodes setting (default 408, 503, 504) applies to responses to an SBC-terminated initial INVITE. It does not concern OPTIONS.
Checked 2026-09-24
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- New-CsOnlinePSTNGateway
- 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 'SBC settings', table row 'Failover response codes / FailoverResponseCodes'
Cite this note
APA
WarmTransfer. (2026, September 24). SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-dr-failover-codes-invite-only. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-options-keepalive-dr-failover-codes-invite-only
BibTeX
@misc{warmtransfer-claim-sip-options-keepalive-dr-failover-codes-invite-only,
title = {SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-dr-failover-codes-invite-only},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-options-keepalive-dr-failover-codes-invite-only},
note = {Source note sip-options-keepalive-dr-failover-codes-invite-only, checked 2026-09-24}
}