[Gta04-owner] Detect Call Hangup / Option Datasheet

[Marcel Holtmann]

Hi Nikolaus,

> > That is why every serious voice modem manufacturer adds a vendor command
> > for call state notifications. And more important why they make ATD123; a
> > non blocking call where OK is returned right away. However it seems that
> > nobody told this to Option. Polling via CLCC is still nasty, but doable,
> > but having a blocking ATD123; is just pure stupid.
> 
> I think it does not block if AT+COLP=0

I can try that later with one of my other Option cards, but this is
kinda weird as well. Since we want to have AT+COLP=1 to get unsolicited
connected line identification.

Regards

Marcel