I’m trying to find a way to communicate state information about a call between the client and PBX. For example, if DND is enabled, i’d like the client to be notified of it by the PBX. If the DND is disabled by the handset, i’d like to be a SIP message sent to the PBX.
Can this type of functionality be handled via RFC3265 (SUBSCRIBE/NOTIFY)? I’d like to key off that state information to display certain things to the client user or to enable/disable certain things on the PBX.
Any help would be very much appreciated.