If there is someone interested, I can send the configs of the working setup. PC - analog modem - 2wire - FXS - 3600 - E1 - E1 cross cable - E1 - AS5300 - MICA modem PC is able to dial over FXS into AS5300 via E1 timeslot (3600 act as a PBX). Thanks to Aaron Leonard and Mark Johnson. Kristian