asterisk users - May 2005 - 2 accounts on one Snom 220 with a queue

Hi All

Does anyone know how to set up two agents on one Snom 220, acting as
agents in a queue. When incoming call go to queue if both the accounts
on the snom 220 are busy the call stays in the queue and if one is not busy
the call will ring through.

I find that even though the second account in the queue is not busy it still
sends a busy signal.

This setup works fine on two phones but not if both agents are on one phone.

Any ideas?

Thanks