Apologies if it's a silly question. But I'm using Asterisk 18.15.0 and I want to know for sure if Asterisk is sending SIP Notify Messages to Polycom VVX phones, or are the Phones them selves sending each other SIP Notify Messages
For Example:
I have to 2 Polycom VVX 500 SIP Phones. (Extension A and Extension B)
Both phones have a Line Key for BLF, and are listening to each other's Line.
I call the DID number for Extension A, with my cell phone. The following message appears on the Asterisk CLI:
Extension Changed <Extension A>[BLF] new state Ringing for Notify User <Extension B>
If Extension A answers the following message appears on the Asterisk CLI:
Extension Changed <Extension A>[BLF] new state Busy for Notify User <Extension B>
Does this mean that Extension A's Polycom VVX 500 phone, is sending SIP Notify Messages to the Asterisk Server, and then the Asterisk Server sends a SIP Notify Message to Extension B to tell it to change the status of Extension A?
OR does the Phone itself send a SIP Notify Message to both the Asterisk Server AND the Other extension to let them know to change the status on the Extension?
I'm asking because recently, My Polycom VVX 500 Phone would say that another Extension is Busy, even when it is not on an active call. And I'm trying to find the culprit.