[Freeswitch-users] registration with DID range

for lab purposes i need to emulate ITSP connectivity with multiple DIDs (range of numbers). For example in FS create 4 extensions 1000-1003. Each extension will forward a particular range of numbers: -1000: +441144630000-99 -1001: +441144630100-99 -1002: +441144630200-99 -1003: +441144630300-99 Then different PBXs will get one the numbers 100x and register it as sip trunk eg 1000@FS_LAN_IP. I would like to ask for some help on how to configure it, please.