Snom Phones are capable to play an audio notification sound when a monitored extension is ringing and you could be able to pick up the call.
In order to make this feature work, the NOTIFY sent by the PBX must be properly formed and the dialog-info XML body should carry the Call-ID information of the active SIP dialog.
Following a NOTIFY example containing Call-ID information:
Remember that BLF functionality must be enabled in that case, in order to establish SUBSCRIBE and receive NOTIFYs as well as be able to pickup.
To enable the audio notification for the incoming call, you need to modify the setting status_msgs_with_audio_indication, containing the value:
You are able to change this parameter via XML provisioning file or via HTTP request as: