How to Park a Call with Grandstream Phones and Asterisk

This assumes you are on the phone with the person you want to park on Line 1.
  1. Pickup Line 2 and dial 70
  2. Press Send (this will then tell you where the call is going to be parked)
  3. Press the Transfer button on the phones
  4. Press Line 1
  5. Now go to any phone and dial the parked number followed by the send key to pick up the call