Our Grandstream SIP phones do not have hook flash button. (Does any SIP phone phone use it anymore?). So, how do I use the parking lot feature? Wiki says to use flash button. Even freepbx does not need that flash button to park a call.
I have a button programmed to dial #6 (so we don’t have to remember the code). I press the button and hang up. The call parks.
On my Grandstream (GRP2613W) there seem to be some settings under Accounts/Advanced Settings BLF (Busy Lamp Field) setting as well as under Phone Settings/Call Settings/Call Park. By enabling these last ones, a menu item appears in the menu available during a call that allows to park the call, but it seems the call is then parked in the phone, not in the voip.ms call park slots, so it can only be retrieved on the same phone.
I also programmed a Virtual Multi-Purpose Key to dial #6 (key mode “Dial DTMF”, and also some other Virtual Multi-Purpose Keys to monitor the parking slots and retrieve the call parked there by just pressing the key (key mode “CallPark”, value set to the corresponding voip.ms call park BLF Extension).