It seems that the users can register but im getting this error:
[May 13 11:37:03] WARNING[4585] chan_sip.c: Bad request protocol Clark@192.168.100.32 SIP/2.0
[May 13 11:45:37] WARNING[4687] app_dial.c: Unable to create channel of type ‘SIP’ (cause 3 - No route to destination)