I think you have to program a 'Handoff' key on your phone
This works both ways push & pull
This is an excerpt from the online help
Conditions and Feature Interactions
Push and Pull Conditions
Handoff is only supported for PRGs.
The call must be in talk state.
The call does not have to originate as a PRG call, nor does it have to be on a key appearance of a PRG member. The prime line of the device Pushing or Pulling the call must be a member of the PRG.
The call must be a two-party call.
An emergency call can be Pushed or Pulled.
A call cannot be Pushed or Pulled if
the call is on a key appearance of a PRG member, but the prime of that device is not a member of the PRG.
the call is on hold.
the call is part of a conference.
the other party is an Attendant console.
Route Optimization is in progress.
Push Conditions
At least one member of the PRG must be available and able to receive a call.
When a call is Pushed, it rings all present members in the group. A Push overrides the following options:
One Busy All Busy
Call Forwarding Always
Call Reroute Always
DND
Make Busy
A call cannot be Pushed if
no PRG members are available to receive the call.
a call is already ringing to the PRG.
a call is Camped On to the PRG.
all other group members are absent.
A Push does not override Group Presence.
Absent members are not presented with Pushed calls.
Pull Conditions
The Pulling device must have an available line to receive the call, and must be idle or listening to dial tone when the Handoff key is pressed.
A call can be Pulled if
the device is in DND Do Not Disturb, Make Busy, or a member is absent from the group, as long as all other conditions are met.
another call is ringing to the PRG as long as the line that is Pulling the call is not ringing.
The prime line of the device the call is being Pulled from must be a member of the PRG and the prime line of the device the call is being Pulled to must be a member of the PRG.
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