Source note · Zoom Phone routing and PSTN connectivity
Zoom sends a SIP OPTIONS request to each configured SBC every 30 seconds and declares the trunk down after four consecutive failed keepalives, which takes 90 to 120 seconds.
Checked 2026-09-24
Zoom sends an OPTIONS request to the target IP Address/Port configured in SBC settings every 30 seconds.
- Vendor
- Zoom
- Product
- Zoom Phone; Zoom Contact Center
- Subsystem
- byoc-p-resilience
- Deployment
- hybrid
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- BYOC-P or BYOP-P call processing — Zoom Communications · tier 2 current vendor documentation · Options Keepalive
Cite this note
APA
WarmTransfer. (2026, September 24). Zoom Phone routing and PSTN connectivity: source note zoom-phone-routing-options-keepalive. WarmTransfer. https://warmtransfer.net/knowledge/claims/zoom-phone-routing-options-keepalive
BibTeX
@misc{warmtransfer-claim-zoom-phone-routing-options-keepalive,
title = {Zoom Phone routing and PSTN connectivity: source note zoom-phone-routing-options-keepalive},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/zoom-phone-routing-options-keepalive},
note = {Source note zoom-phone-routing-options-keepalive, checked 2026-09-24}
}