The settings on the Mobile page are for iOS support.
When iOS users click a call link, the server redirects them to the value set in the Redirect URL for iOS field. The default value of the Redirect URL for iOS field is a Cisco Jabber Guest welcome page.
On the client side, users are then redirected to a special URL using the scheme value set in the iOS URL scheme field , which allows the appropriately registered native application to launch into the call. The default value of the iOS URL scheme field is jabberguest.
If Cisco Jabber Guest is not installed, users are then redirected to the value set in the iOS App Store link field. By default, the iOS App Store link field contains a link to download Cisco Jabber Guest.
If your organization has developed its own iOS application that implements Cisco Jabber Guest, you can update these fields so that your application opens instead of Cisco Jabber Guest.
Alternatively, if you do not want an application to open when iOS users click a call link, you can edit the Redirect URL for iOS field to redirect users to another location, such as a web page.