Alert Info for internal calls

Hi

Is there anyway to set Alert Info for internal calls on a Snom 320. I have it setup in the extension configuration for external DID calls and this works great but the phone doesn’t revert back its default ringer for internal calls so I need to somehow set the sipaddheader for internal calls as well.

The only way I can think of doing this would be to manually add all my extentions in the extensions_custom.conf file and remove them from the normal extension setup in FreePBX.

Is there any other way around this, maybe setting a global variable for all extensions?

Thanks
Kevin Boddy