call queue

I have a call center that has agents dial in to the company DID and dial in a code and it signs them on and sends the call to them. Some of the agents work with their cell phone as a forwarded call, is there anywhere in the system that i can setup the remote dial in for the agent to log in or...

I have a customer that wants the phones to ring before the call goes into IVR, but they want it to show a missed call alert on all the phones for this call. Is it possible to disable missed call alert on this ring group, or do I have to go with a call queue?