Source note · Unified CM Session Management Edition
The 8.6 SME guide notes that IP PSTN service providers typically require SIP Early Offer on trunks to them and that most support voice calls only.
Checked 2026-09-25
For SIP trunks to an IP PSTN, SIP Early Offer is typically required by the service provider, and most providers support voice calls only.
- Vendor
- Cisco
- Product
- Unified Communications Manager Session Management Edition
- Subsystem
- PSTN access
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Unified CM 8.5-8.6
- Checked
- 2026-09-25
Sources
- Cisco Unified Communications Manager Trunks (Session Management Edition deployment guide 8.6(1)) — Cisco · tier 2 current vendor documentation · Trunks chapter, multi-cluster deployments 8.5 and later
Cite this note
APA
WarmTransfer. (2026, September 25). Unified CM Session Management Edition: source note cucm-session-management-edition-ip-pstn-early-offer. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-session-management-edition-ip-pstn-early-offer
BibTeX
@misc{warmtransfer-claim-cucm-session-management-edition-ip-pstn-early-offer,
title = {Unified CM Session Management Edition: source note cucm-session-management-edition-ip-pstn-early-offer},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-session-management-edition-ip-pstn-early-offer},
note = {Source note cucm-session-management-edition-ip-pstn-early-offer, checked 2026-09-25}
}