I am implementing IP Peer between 3 sites with SIP. I have 2 site configured with Virtual TRK &D channel. I have these sites working with CDP without NRS implemented. They are configured as Alternate and Failsafe. I will be adding the main site witch will be the Primary and the co-resident NRS. After reading the IP Peer documentation for Rls 4.5 to implement IP Peer Networking with SIP, does NRS HAVE to be program for SIP to work or can it work with just the SIP Gateways information. Also they will be using Virtual Office in the future. Thanks.