I have a customer with a point to point T1 that has a drop and insert DSU to a PBX (16 data, 8 voice). They want to install a second T1 but want to bond these 24 channels with the 16 channels on the other one, to make it appear as if it is one circuit. I know that MLPPP is simple with two standard T1 circuits, but not sure about circuits with different number of channels. I heard that new code on an ISR is capable of doing this, but has anyone tested this?
My thought is to use a drop and insert module for the 1st circuit and a VWIC for the second router.