Webex Calling Dedicated Instance applicability
Verified 2026-09-05 · 12 claims · sources tier 2
Also known as Webex Calling DI.
Dedicated Instance provides a single-tenant cloud calling option built on the Unified Communications Manager architecture with centralized Webex Calling administration 2. It serves as a migration option with regional availability rules that dictate where deployments can be established 6.
How it works
Dedicated Instance is built on the Cisco Unified Communications Manager architecture and integrated with Webex Calling for centralized administration 2. The add-on bundles Cisco Unified Communications Manager, optional Cisco Unified IM and Presence, Cisco Unity Connection, Cisco Expressway, Cisco Emergency Responder in the Americas region only, and optionally Cisco Session Management Edition 1. A fully deployed Dedicated Instance cluster supports up to 8 call processing servers or approximately 50000 devices on Unified CM version 14 and above 7.
Platform differences and interoperation
Calling features are not harmonized between Dedicated Instance and Webex Calling multi-tenant; for example a multi-tenant Webex Calling user cannot be a member of a hunt group hosted on Dedicated Instance 3. A PSTN connection and a main number on the Webex Calling multi-tenant side are required for the interoperation SIP trunk between multi-tenant and Dedicated Instance to route calls successfully 4. Cisco positions Dedicated Instance as a low-disruption migration path from on-premises Unified CM, preserving the same features, user experience, and integration options and requiring no retraining for existing Unified CM customers 5.
Regional restrictions
Cisco states there are no new Dedicated Instance deployments in the EMEA region, so new customers in that region must choose a different data centre region 6.
Applicability
- Vendor: Cisco 2
- Product: Dedicated Instance, Webex Calling, Cisco Unified Communications Manager, Cisco Unified IM and Presence, Cisco Unity Connection, Cisco Expressway, Cisco Emergency Responder, Cisco Session Management Edition 21
- Deployment: Dedicated Instance 2
- Releases Covered: Unified CM 14 and later 2; current as of 2026-09-04 6
What remains uncertain
- Specific technical criteria or timelines for when or if EMEA new-deployment restrictions might be lifted are not detailed in the claims.
- Exact sizing or device scaling limits for versions below Unified CM version 14 are not addressed.
See also
Referenced by
- CUCM to Webex Calling migration — Single-tenant target that preserves the Unified CM feature set
- Webex Contact Center voice channel and PSTN options — Dedicated Instance integration requires certificate-based trunks
- Control Hub notifications and threshold alerts — Three alert types do not fire on Dedicated Instance trunks
Claims
| # | Claim | Status | Confidence | Verified |
|---|---|---|---|---|
| 1 | The Dedicated Instance add-on bundles Cisco Unified Communications Manager, optional Cisco Unified IM and Presence, Cisco Unity Connection, Cisco Expressway, Cisco Emergency Responder in the Americas region only, and optionally Cisco Session Management Edition. Introduction to Dedicated Instance · Overview bullet list | fact | 0.90 | 2026-09-04 |
| 2 | Dedicated Instance is a single-tenant cloud calling option built on the Cisco Unified Communications Manager architecture and integrated with Webex Calling for centralised administration. Introduction to Dedicated Instance · Overview | fact | 0.90 | 2026-09-04 |
| 3 | Calling features are not harmonised between Dedicated Instance and Webex Calling multi-tenant; for example a multi-tenant Webex Calling user cannot be a member of a hunt group hosted on Dedicated Instance. Introduction to Dedicated Instance · Basic Inter-Op | fact | 0.90 | 2026-09-04 |
| 4 | A PSTN connection and a main number on the Webex Calling multi-tenant side are required for the interoperation SIP trunk between multi-tenant and Dedicated Instance to route calls successfully. Dedicated Instance for Webex Calling — base configuration · Cisco configured components, Location row | fact | 0.90 | 2026-09-04 |
| 5 | Cisco positions Dedicated Instance as a low-disruption migration path from on-premises Unified CM, preserving the same features, user experience and integration options and requiring no retraining for existing Unified CM customers. Introduction to Dedicated Instance · Simple migration path, No Disruptions | fact | 0.90 | 2026-09-04 |
| 6 | Cisco states there are no new Dedicated Instance deployments in the EMEA region, so new customers in that region must choose a different data centre region. Activate Dedicated Instance · Region selection guidance | fact | 0.90 | 2026-09-04 |
| 7 | A fully deployed Dedicated Instance cluster supports up to 8 call processing servers or approximately 50000 devices on Unified CM version 14 and above. Introduction to Dedicated Instance · Dedicated Instance sizing | fact | 0.90 | 2026-09-04 |
| 8 | On the evidence gathered, the choice between Dedicated Instance and Webex Calling multi-tenant turns on whether the organisation wants to preserve its existing Unified CM feature set and administration model or is willing to re-platform onto Webex Calling's native feature set; Cisco does not publish an explicit decision tree or a named migration tool that distinguishes the 2 paths. Introduction to Dedicated Instance · synthesis across the three Dedicated Instance articles | inference | 0.60 | 2026-09-04 |
| 9 | Cisco states that the devices and features migration steps also apply to Dedicated Instance, not only to Webex Calling multi-tenant. Migrate devices and features from Unified CM to Webex Calling · Applicable context note | fact | 0.60 | 2026-09-04 |
| 10 | Call quality drop, trunk status change and trunk concurrent call limit alerts are not triggered on Dedicated Instance based trunks. Notifications in Control Hub · Add a call quality drop alert, Add a trunk status change alert and Add a trunk concurrent call limit alert | fact | 0.90 | 2026-09-05 |
| 11 | A separate certificate expiry alert for Dedicated Instance is sent 67 days before expiration and then every 12 days until the certificate is renewed. Notifications in Control Hub · Certificate expiry alert, Dedicated Instance section | fact | 0.90 | 2026-09-05 |
| 12 | The Webex Calling data centre location article explicitly excludes Webex Calling Dedicated Instance from its scope. Data Center locations for Webex Calling · closing note | fact | 0.90 | 2026-09-05 |
Sources
Activate Dedicated Instance
Data Center locations for Webex Calling
Dedicated Instance for Webex Calling — base configuration
Introduction to Dedicated Instance
Migrate devices and features from Unified CM to Webex Calling
Notifications in Control Hub
Cite this page
APA
WarmTransfer. (2026, September 5). Webex Calling Dedicated Instance applicability. WarmTransfer. https://warmtransfer.net/knowledge/webex-calling-dedicated-instance
BibTeX
@misc{warmtransfer-webex-calling-dedicated-instance,
title = {Webex Calling Dedicated Instance applicability},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/webex-calling-dedicated-instance},
note = {Verified 2026-09-05}
}