why client cant call through my asterisk server?? -SOLVED

why client cant call through my asterisk server??
i set up asterisk in LAN, i can call to a client from the server...but client cant call up through the asterisk...
i had disable the firewall and SELinux...so what is the problem???
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SOLUTION:
using sjphone....
Preferences=>Profiles=>[select the account you want] and Edit=>SIP Proxy
- check the 'Proxy is strict outbound'...
i set up asterisk in LAN, i can call to a client from the server...but client cant call up through the asterisk...
i had disable the firewall and SELinux...so what is the problem???
------------------------------------------------------------------------------------------
SOLUTION:
using sjphone....
Preferences=>Profiles=>[select the account you want] and Edit=>SIP Proxy
- check the 'Proxy is strict outbound'...