I know that i need to set the dialplan,
 
my problem is when FS_B send a REGISTER to FS_A, FS_A will return a 403 to FS_B
 
Like this:
 
2009-06-30 15:03:25 [NOTICE] sofia_reg.c:305 sofia_reg_check_gateway() Registering FS_A
2009-06-30 15:03:25 [ERR] sofia_reg.c:1391 sofia_reg_handle_sip_r_register()
                 FS_A Registration Failed with status Forbidden [403]. failure #2
2009-06-30 15:03:25 [WARNING] sofia_reg.c:334 sofia_reg_check_gateway()
                 FS_A Failed Registration, setting retry to 30 seconds.
 
>  Create a dialplan for FS A to communicate to FS B.
> 
>  dialplan/default/00_fsa.xml
> 
>   <extension name="dialfreeswitch">
>     
>      <condition field="destination_number" expression="^(\d+)$">
>        <action application="set"
>  data="effective_caller_id_number=${outbound_caller_id_number}"/>
>        <action application="set"
>  data="effective_caller_id_name=${outbound_caller_id_name}"/>
>        <action application="bridge"
>  >  data="sofia/gateway/FreeSwitch/1$218.210.xxx.xxx"/> -> IP of FS B
>      </condition>
>    </extension>

>  To check if your gateway succeed

>  just type on sofia status check if gateway FreeSWITCH is there connection is
>  set and ready to go :)