I currently have a VoxIP T1 through Windstream. T1 goes to Cisco IAD 2400 series and splits data and voice channels... Currently in place is a 3com NBX 100 w/V3000 Dell PowerConnect 3448p switch. If I put n Elastix system in place, do I only have to connect the onboard NIC to the switch for the data, when using IP phones? ...and a T1 x-over from the Cisco to the Elastix T1 card? Input appreciated!