What is required on the Callmanager side to integrate with the EXTENSION app?
Generally speaking, third-party apps require an Application User account with either superuser CTI Manager access (i.e. all control of all devices) or the phones directly associated to the account. Alternatively, some applications - namely paging apps - want to replace the Authentication URL string to point at their server instead of CUCM so they can blindly authorize XML SDK requests from the phones.
How is text delivered to the Callmanager using the EXTENSION app?
The application will send an XML SDK call to the phone's IP address (which it may need to find out from another API on CUCM). The phone will ask the Auth URL to validate the request, and then execute the action. In many cases this is an HTTP URL that returns an XML-formatted document. This gets displayed as text.
Is it possible to send a text to mulitple 7925 phones at once? Like a distribution group?
That's up to the app that issues the XML SDK calls. It would need to issue a command to each phone it wants to broadcast the message to. There is no broadcast mechanism inherently because the API is within the phone itself, not in CUCM.
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