I’ve been testing SUBSCRIBE & NOTIFY events used by Grandstream wave and Zoiper softphone for PRESENCE. It turns out 3 states are possible with Zoiper: Available, On the phone and Offline but only 2 possible states on GS wave: Confirmed (on the phone) and terminated (Online) but there’s an issue with the offline state.
As far as I have read, turns out Zoiper request for the presence status but GS wave and other GXP phone with the same issue doesn’t. Here’s the part sent by Zoiper:
User-Agent: Z 5.2.25 rv2.8.112
Is there any way to request the presence status on the GS wave SUBSCRIBE request?
Thanks in advance.