Most E1's I have seen in most of south america are 75ohm coax or 120 ohm rj48 (twisted pair)
I'm not sure anyone delivers 120 ohm over coax anymore but you never know.
If the coax is a issue many of the providers will put in a balun to convert it to 120ohm twisted pair. There are many vendors that sell these even cisco does CAB-ADPT-75-120