[Serusers] STUN and (Media/RTP)Proxy

[Mohammad Khan]

Kaaus, thansk for replying me.

One more question regarding this issue,

Say for example:
1. A UA is behind Symmetric NAT and its using STUN.
2. If SER use nat_uac_test(3), it will return true, right?
3. If UA is behind other types of NAT, would nat_uac_test(3) still 
return true?

My question is, If a UA use STUN, SER dont need to do anything for NAT 
for first three types of NAT.
Is nat_uac_test return false for first three types of NAT?

Thanks again,
Mohammad


Klaus Darilion wrote:

> The client will use STUN to detect the type of NAT (coned, symmetric 
> ...) and the public IP address:port.
>
> If the NAT device can be traversed by means of STUN, then the client 
> uses the public IP address and port in the SIP messages (Via: header, 
> Contact: header, SDP, ...).
>
> If the NAT device can't traversed by use of STUN (symmetric NAT), the 
> client has to behave dumb and does not use the public addresses. Thus, 
> it uses its private IP address:port (e.g. 192.168.0.2:5060) in the SIP 
> messages.
>
> In ser, you will use nat_uac_test() to test the incoming messages. You 
> can test for private IP addresses in the various headers (Via, 
> Contact, SDP) and compare the Via: header with the IP-address:port the 
> message is coming from. If the client uses STUN and public IP 
> address:port in the SIP message, ser can not detect if the client is 
> behind NAT. Thus, ser does not NAT traversal - as it should be, 
> because the client das NAT traversal itself.
>
> If the nat_uac_test detects that the SIP messages comes from a natted 
> client, then you have to use the various functions (force_contact, 
> nated_register, force_rtpproxy...) to rewrite the SIP messages.
>
> regards,
> klaus
>
> PS: read the README from the nathelper module and the mediaproxy 
> module. You have to choose either nathelper-module+rtpproxy or the 
> mediaproxy-module+mediaproxy (from ag-projects).
>
>
> info at beeplove.com wrote:
>
>> If a client come through STUN and behind NAT,
>> SER dont need to do anything to handle NAT.
>> correct me pls, if I am wrong.
>>
>> How ser will figure it out that whether a client is coming through 
>> STUN or
>> not?
>>
>> Thanks,
>> Mohammad
>>
>>
>>
>>
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