[Freeswitch-dev] Dialup modem calls

Does anyone know is possible to pass DIALUP modem calls over, through FreeSwitch? Nothing extra needed I think, say FreeSwitch is in-between of 2 telcos, connected over E1 from both sides. Modem calls is already DATA, so will it work, or FreeSwitch will make some sort of codec resampling, so original E1 data will be lost? This is not supported by Asterisk, and I'm looking for the SW to have it supported.