I am newbee of freeswitch.( many year experience on asterisk / Elastix / freepbx) I checked freeswitch is great as a soft switch, and Asterisk (Elastix / freepbx / PIAF and so on) have more feature as the pbx. So my idea is using freeswitch as the the main hub ( to SIP trunk, which will provide hundreds DID to many PBXes like asterisk. I checked forum, looks the wiki only have FreeSwitch as the client of Asterisk, which my requirement is reverse. Asterisk as FreeSwitch client. I tested using x-lite can successfully register on freeswitch, and can dial in dial out with no problem, however, I using Asterisk (Elastix) register on FreeSwitch ( both public IP), at Asterisk side, I can see asterisk registered on freeswitch, however, I use another freeswitch exten (for example 1003 as example config) dial asterisk (exten 1000 ) system not working. ( voice response, "the exten 1000 is not available, ....".) but if I using x-lite register the free switch, 1003 can dial / ring 1000. system environment is Debian 7.5 with binary code from freeswitch. (not compile on the Debian VM) Debian 7.5 is install as a Virtual machine on VMware 5.5 host. another problem is MOH not working. Any ideas are appreciated.