Cisco WAN :: 2600 / Running Older Routers In Reverse

I have some legacy (read: old) audio equipment that used leased lines to run, no way to convert them to IP internally. They have x.21 and v.35 interfaces on them.
 
Is there a way i could use something like an old 2600 series router and run it in reverse, like just using them as a media converter to shove the v.35 over into IP land?
 
I'm not interested in buying newest latest greatest (these audio codecs are upwards of $5k a pop to replace, x2 for a complete link), i'm just curious if i can turn a WIC-1T into the interface for these boxes and do a direct route to another 2600 on the other end with the same configuration.
 
This would essentially turn the WIC portion into the local side and the ethernet into the WAN side.