GOIP 4/8/16/32 Channel configuration

Hello all, I need to configure a 32 channel goip device from hybertone. So far i have been able to make both inbound and outgoing calls. I am quite stuck on the call forwarding of the goip device. I have set a hunt group mode on the device and I want all incoming calls of Line 1 to forward to any available line i.e when a call comes into the Line 1, it automatically forward it to available line 2-32 so another call can enter Line 1 instead of giving busy tone to the caller. Also, can this forwarding be done so the caller do not hear a message like, “your call is been forwarded to another number”?

Thank you