!@£$%^ and simultaneous users

I've just configured !@£$%^ SIP account in X-lite, it works but just with one user.
I have a small Call Center, and I got the SIP account in order to call from much users using one account, as I can do it with other providers it does not work with !@£$%^. Is there anything I can do?

!@£$%^ allows only one user calling per account at the same time. If you want to call from much users using one account, !@£$%^ is not your choice.