Deployment guide for Calling in Webex App (Unified CM) - Prepare your environment for Calling in Webex App (Unified CM)

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cloudCollaboration/wbxt/ucmcalling/unified-cm-wbx-teams-deployment-guide/unified-cm-wbx-teams-deployment-guide_chapter_011.html

Published

2025-11-10

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco website terms of use; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• The Expressway-E certificate must include the Unified CM registration domains as subject alternative names. in context
• Unlike Jabber, Webex App does not prompt users with the option to accept an untrusted certificate. in context
• For MRA with self-signed certificates, the Unified CM Tomcat and CallManager certificates must have different common names because Expressway cannot trust two self-signed certificates with the same CN. in context
• Certificates using deprecated signature algorithms such as SHA-1 are not supported; Unified CM certificates must use SHA-256 or a later secure signature algorithm, and must chain to a CA known to the operating system or a self-signed certificate the administrator has deployed to the OS in advance. in context
• For centralized call history, the user's Webex email account must match the mail ID of the Unified CM end user. in context
• An Expressway-C and Expressway-E traversal pair at X8.11.4 or later is required for Calling in Webex App (Unified CM) over MRA. in context
• MRA failover for Calling in Webex App (Unified CM) requires Expressway Release X14.0 or later. in context
• Push notifications for Webex App over MRA require Expressway X12.6 or later. in context
• Because Webex App gives users no option to accept an untrusted certificate, a Unified CM or Expressway certificate the endpoint OS does not already trust is likely to stop phone-services sign-in rather than prompt the user. inferred in context
• User accounts must be managed in the Webex organization but do not need a specific license assignment to use Calling in Webex App (Unified CM). in context
• Webex App softphone registrations count toward Unified CM device licensing, and users with three or more apps or devices require CUWL perpetual licensing or a Flex Calling subscription. in context
• Users of Calling in Webex App (Unified CM) must be in a Webex organization managed in Control Hub with a paid subscription. in context
• Calling in Webex App (Unified CM) on desktop requires Unified CM Release 11.5(1) SU3 or later. in context
• Apple Push Notification support for Webex App on iOS requires Unified CM 11.5(1) SU8 or a later SU on the 11.5 release, or 12.5(1) SU3 or a later SU on the 12.5 release. in context
• MRA failover for Calling in Webex App (Unified CM) requires Unified CM Release 14.0 or later. in context
• For server performance reasons, Cisco advises not to use Visual Voicemail with both Jabber and Webex App at the same time. in context
• Calling in Webex App over MRA needs Expressway X8.11.4 or later. Push notifications need X12.6 or later, and MRA failover needs X14.0 or later. in context
• For iOS, Calling in Webex App (Unified CM) needs at least Unified CM 11.5(1) SU8 or 12.5(1) SU3. MRA failover needs Unified CM 14.0 or later. in context
• For Calling in Webex App (Unified CM), users with three or more apps and/or devices need CUWL perpetual licensing, or the organization must be on a Flex Calling subscription. in context
• For server performance reasons, Cisco says not to use Visual Voicemail in both Jabber and the Webex App at the same time. in context
• The Webex web app (web.webex.com) does not let users call phone numbers under Calling in Webex App (Unified CM). in context

Cite this source record

APA

WarmTransfer. (2025, November 10). Deployment guide for Calling in Webex App (Unified CM) - Prepare your environment for Calling in Webex App (Unified CM). WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-docs-ucmcalling-prepare-environment

BibTeX

@misc{warmtransfer-cisco-docs-ucmcalling-prepare-environment,
  title  = {Deployment guide for Calling in Webex App (Unified CM) - Prepare your environment for Calling in Webex App (Unified CM)},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-docs-ucmcalling-prepare-environment},
  note   = {Cisco Systems, accessed 2026-09-24}
}