Areas for consideration
Choose your cloud calling solution - Cisco Webex calling
Choose from a list of cloud connected service providers or
Bring your own gateway and leverage your existing PSTN infrastructure
Use existing call control and provide cloud capabilities with Webex Edge for Devices via the device connector tool.
Resources
Utilize your existing PSTN provider to put telephone number on your video endpoints
Requirements for Business to Business (B2B) SIP Calls to and from the Cisco Webex Cloud
Supported Devices for Calling