We currently have two physical incoming telco lines - one VOIP and one currently ISDN. The VOIP line is currently being used for all data traffic. The latter is now being "force" converted to VOIP by the telco provider, and I was advised we would need a second router for this telco line.
My question is, whether it is possible to double the bandwidth by running data traffic over both lines (no specific requirement as to what traffic runs over which telco line) in parallel? Most likely there would be problems with colliding IP addresses - default gateway and any other IP addresses utilized by the routers themselves. I imagine there are routers capable of addressing two incoming telco lines, but how expensive would one be im comparison to two separate commonly available routers?
Any suggestions would be appreciated. The other posts on this topic all address a different scenario.