[Serusers] multiple sip phones behind one NAT gateway

[Ronald Ramos]

Hi,
 
I have a problem on calling between phones behind one NAT gateway, the
call make it but the problem is we can't hear ourselves talking.
When I'm making a call outside the NAT I'm in, call makes it and we can
really talk, I use STUN server for this.
 
Is there a way I can identify different phones behind one NAT gateway?
For example by using different ports on the SIP phone? 
 
Ronald
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