Webex Calling PSTN options and selection

Verified 2026-09-04 · 7 claims · sources tier 2

Also known as CCP, CCPP, Cisco PSTN, premises-based PSTN.

Webex Calling provides multiple PSTN connectivity options that determine how calls reach external networks. PSTN connectivity is administered at the location level to govern routing behavior across an organisation 7​5.

Connectivity Options

Webex Calling offers three PSTN connectivity options: Cisco Calling Plan, Cloud Connected PSTN from a partner provider, and premises-based PSTN through a Local Gateway 7. Cloud PSTN, whether Cisco Calling Plan or Cloud Connected PSTN, provides PSTN access only for Webex Calling users; calls originating from premises users cannot reach the cloud PSTN through that path 2. Additionally, Cisco Calling Plans are not supported with Webex Contact Center, nor for high-concurrency, high-volume, or unusually short or long call profiles 1.

Location Binding and Selection

Exactly one PSTN choice can be configured for each Webex Calling location 5. Different locations in the same organisation may use different PSTN types, for example Cisco Calling Plan at one location, Cloud Connected PSTN at a second and Local Gateway at a third 4. The PSTN provider used for a call depends only on the originating location of the Webex Calling call; no other attribute of the call affects PSTN selection, not even the called number 6.

Migration

Changing a location from one PSTN type to another is partly self-service, partly a manual migration, and in a small number of combinations unsupported 3.

Applicability

• Vendor: Cisco
• Product: Webex Calling
• Deployment: Multi-tenant deployments (including hybrid Webex Calling with on-premises Unified CM and deployments utilizing Cisco Calling Plans)
• Releases Covered: Current as of 2026-09-04

What remains uncertain

• The specific combinations of PSTN types that are unsupported during a migration are not exhaustively detailed in the claims.
• The exact operational steps required for the manual portion of a location PSTN migration are unspecified.
• The precise thresholds that define high-concurrency, high-volume, or unusually short or long call profiles for Cisco Calling Plans are not defined.

WarmTransfer. (2026, September 4). Webex Calling PSTN options and selection. WarmTransfer. https://warmtransfer.net/knowledge/webex-calling-pstn-options

@misc{warmtransfer-webex-calling-pstn-options,
  title  = {Webex Calling PSTN options and selection},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/webex-calling-pstn-options},
  note   = {Verified 2026-09-04}
}