[Serusers] STUN and (Media/RTP)Proxy

[Greger V. Teigre]

The Getting Started document found at http://onsip.org/ has a thorough 
walkthrough of NATing with examples for mediaproxy and rtpproxy.
g-)

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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>
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