|

Control Callback Routing Options for Edge Audio in Webex

ByCorporate Guider Home, Webex

The call will automatically retry over a PSTN connection if the call fails to connect to Cisco Webex Edge Audio. It is possible to turn this off through the Cisco Webex Control Hub or Cisco Webex Site Administration.

Webex routes calls over the Internet when Edge Audio callback is enabled for one or more countries, and when this is enabled for more than one country. The Webex application will retry the call over a PSTN connection if a DNS, TCP, or TLS connectivity issue, or if the call fails with an error response of 380, 400-699, or 380, is encountered.

In the event that an Edge Audio call fails over a PSTN path, PSTN charges will apply. In accordance with your contract, PSTN charges will be billed to you.

There is the option to retry calls using PSTN Audio by default, but you can disable it if you wish. Calls that are retried using PSTN Audio are triggered when a user selects the callback option during his/her call and the call fails as a result. In dial-in scenarios, retrying the call with PSTN Audio is not available.

SIP response to stop PSTN fallback

Any failed Edge Audio callback on your site will automatically attempt to fallback to Webex PSTN audio if you have enabled PSTN fallback on your site. The SIP response 608 bit can be passed to Webex if you detect suspicious callback numbers and are intent on terminating the call. This can be done by passing SIP response 608 to Webex to stop the PSTN fallback.

Disable Retry Call Using PSTN Audio from Site Administration

In the Webex Site Administration, or if you have completed the Site Linking process, you are able to turn off the option to have retry calls using PSTN Audio if you manage your Webex sites there.

  1. Using Site Administration, log in to your account and go to Configuration > Common Site Settings > Audio Settings.
  2. It is recommended that you uncheck the option Retry Call using PSTN Audio under Retry Callback settings.
  3. Click on the Apply Settings button.

Disable Retry Call Using PSTN Audio from Control Hub

The Retry call using PSTN Audio option is disabled in Control Hub if you have set up and managed your Webex sites in the same place.

  1. Go to the customer view in the admin console at https://admin.webex.com, then click on Services, then click on Meetings, then click on Sites.
  2. Select the site you would like to set up Edge Audio on, and click on Configure Site after selecting the site you wish to configure.
  3. The choice is yours when it comes to Edge Audio.
  4. There is a checkbox in the Callback settings that says Retry Call Using PSTN Audio, which should be unticked.
  5. Click on the Apply Settings button.

Number Blocking from Unified CM

Depending on which callback destination you specify in Unified CM Administration, you can either use Edge Audio or PSTN connection for your callbacks. Calls that encounter 380 or 400-699 SIP error responses will be retried using PSTN audio if they encounter 380 or 400-699 SIP error responses.

During a call, if a problem occurs

  • In the event of an SIP error 500-599, all A records will be tried.

  • The server will not retry all A records if it receives a 380, 400-499, or 600-699 SIP error.

The Edge Audio callback can be configured to only run on network destinations if you wish. To accomplish this, in Unified CM Administration, remove access to the PSTN route patterns from the trunk that is used for Edge Audio in the routing table. The Unified Communications Manager then rejects and retries all callback requests to off-network destinations after this change, and the calls are made using PSTN Audio over the PSTN.

You must update the blocking reason in Unified CM if you plan to remove access to the PSTN route patterns as part of the procedure. The blocking reason is typically set to “No Error” by default.

It is recommended to make sure your Unified CM calling search space (CSS) does not have access to the partitions that contain PSTN route patterns if you want Edge Audio to route on network phone numbers to Unified CM while routing off network phone numbers using a Webex PSTN.

Similar Posts