[Serusers] How to check if callee is behind NAT ?

[jimmy huang]

Hi  all,
now i can configure SER to check if caller is behind NAT , and modified SDP . forece using rtpproxy ,
 so client can successed make voice call through NAT/Firewall

but if caller is in public network , and callee is behind NAT ,
how to check if calee is behind NAT , and modify SDP , also force caller and callee to use rtpproxy 
in ser.cfg ??

now i can only check if caller is behind NAT or not 
but i don't find any related document has mention how to check if calee is behind nat ,
or in current version , NAT/Firewall traversal only works if caller is behind NAT ?

can any one give me some idea ?

thanks 
jimmy
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