With a box like the Adtran Atlas you’d be able to give them the PRI’s and hand the rest off as a DS-3 or HSSI.
-Dave
MessageI'd have to go look this up and try to find the specific product,
but I remember someone was offering a device on both ends which would
allow you to take a DS3 carve off PRIs, data, etc without needing to
channelize it. When the non-data channels weren't in use, they would be
available for data traffic.