Are you looking to be able to dial into the IPT system and change the CFA settings of a phone? If so, and if you are using a version of CallManager that supports AXL SOAP API, you could build a CRA application that can change the CFA table via AXL. With this, a user could dial in and interact with the CRA-based IVR applet to change the CFA setting for their phone.
Alternatively, you could create a CRA based IVR application that allows a user to dial in and have their call redirected based on caller input. Such an application could be built around a 3rd party database that contains authentication codes and permitted numbers. A caller dialing into the IVR would enter their authentication code, and CRA would verify the code against the database. If successful, the call could be redirected to the Callmanager with a prefix that serves as an access code. The route plan in Callmanager should be configured to route the calls with the prefix accordingly.
No, I'm not looking to change the CFA for a phone. Someone asked if we could do it like the old days when the Telco techs used the PBX to get free toll access through the system. Except the question came from the customer we're installing the IPT system. He wanted to know if he can dial into his IPT system and dial out LD or Local as if the call was originating from the CallManager.
You can do this using the configuration where the CRA-based IVR dips a third party database and if successful, redirects the call with an access code prefix. The configuration for this is obviously not trivial, hence the need to go through the Developer Support program for help on it.
The thing to be concerned about is to design it in such a way as to mitigate the risk of rogue users committing toll fraud by using your IPT system to place long distance or international calls. One way to do this would be to use long access codes (the longer the access code, the more difficult it is to decipher) that are reachable only through the CSS of the CTI ports used by CRA.
Short answer to your customer's question is it can be done. The functionality is however not native to Callmanager yet, so it will take some work.
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