Source note · Zoom Phone routing and PSTN connectivity
On BYOC-P/BYOP-P trunks Zoom supports PRACK for reliable 1xx responses but does not use REFER or SUBSCRIBE/NOTIFY.
Checked 2026-09-24
Zoom supports the PRACK mechanism for reliable 1XX responses but does not use REFER or Subscribe/NOTIFY.
- Vendor
- Zoom
- Product
- Zoom Phone; Zoom Contact Center
- Subsystem
- byoc-p-sip
- 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 · Outbound calls from Zoom
Cite this note
APA
WarmTransfer. (2026, September 24). Zoom Phone routing and PSTN connectivity: source note zoom-phone-routing-zoom-no-refer-outbound. WarmTransfer. https://warmtransfer.net/knowledge/claims/zoom-phone-routing-zoom-no-refer-outbound
BibTeX
@misc{warmtransfer-claim-zoom-phone-routing-zoom-no-refer-outbound,
title = {Zoom Phone routing and PSTN connectivity: source note zoom-phone-routing-zoom-no-refer-outbound},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/zoom-phone-routing-zoom-no-refer-outbound},
note = {Source note zoom-phone-routing-zoom-no-refer-outbound, checked 2026-09-24}
}