[Asterisk-Users] Sip behind the NAT

[janvb at caselaboratories.com]

It can also be that the NAT is not truly SIP aware as it will create 
some confusion if the IP address in the IP header is converted, while 
the IP address in the SIP header is not. One cause would be that 
messages are send to wrong address.

Jan

Wilson Pickett wrote:

>>i have an asterisk box behind the NAT ,when i try to
>>send calls through Sip to the voip provider server the
>>call is answered but in a one way calling,I hear  the
>>voice of the other side just for 4 seconds and then
>>stop but the call do not hangup.
>>    
>>
>
>SOmetimes this can be due to the client using silence suppression.
>Make sure this function if OFF.
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