I need to make a point to point application with 2 Multimodem EDGE modems (MTCBA-E-EN).

If your Edge wireless provider gives out public IP addresses when the edge modem connects, then you can setup a GRE tunnel between two ethernet edge modems to bridge the two IP networks together. Please see our document "how to_gre.txt" at:

https://webfiles.multitech.com/resolutions/documents/wireless/how%20to_gre.txt