the remote office had T1 service before & now switched to comcast, so has new comcast business gateway router & local office had comcast & added some phone lines through them & so comcast installed a new gateway router at local ofiice too. Both offices have same model SMC routers provided by comcast. They have a vpn tunnel between the 2 offices dedicated only for phones since their PBX is Panasonic IP system. They had this even before they made changes in ISP.but the VPN tunnel is set using Linksys VPN routers running on static IP on both locations. At local office only PBX is connected to VPN router, all computers are connected to comcast router. At remote office only IP phones are hooked upto VPN router & all computers are connected to comcast router. This setup has not changed, only change made was removing the T1 router & replacing it with comcast gateway router at remote office & just changing comcast router with a different model at local office.

Butch Cassidy, server was & is still at local office & their ISP has't been changed. Its remote office where isp change is made.