Source note · Moving from Unified CM to Zoom Phone
Zoom requires the SBC to send INVITEs with an SDP offer (early offer), and Zoom's own outbound INVITEs also carry the SDP offer.
Checked 2026-09-25
Zoom requires the SBC to send an INVITE with the SDP offer included (early offer).
- Vendor
- Zoom
- Product
- Zoom Phone
- Subsystem
- SIP call processing
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- BYOC-P or BYOP-P call processing — Zoom Communications · tier 2 current vendor documentation · Incoming calls to Zoom and Outbound calls from Zoom sections
Cite this note
APA
WarmTransfer. (2026, September 25). Moving from Unified CM to Zoom Phone: source note cucm-to-zoom-phone-early-offer-required. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-to-zoom-phone-early-offer-required
BibTeX
@misc{warmtransfer-claim-cucm-to-zoom-phone-early-offer-required,
title = {Moving from Unified CM to Zoom Phone: source note cucm-to-zoom-phone-early-offer-required},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-to-zoom-phone-early-offer-required},
note = {Source note cucm-to-zoom-phone-early-offer-required, checked 2026-09-25}
}