Outgoing call while phone is ringing

[rookie01]

Hi Guys,

We have setup a queue with 4 Ext's where it rings all phones, The phones need to be able to make an outgoing call even when the phones are ringing.

Is there anyway to do this? Currently if the phones are ringing then there is no way to make an outbound call?

We have tried to setup a second line on the phone but still you cant make a call out when a call is coming in on a different line.

We are using T46G phones with firmware version 28.71.0.180.