[SR-Users] Kamailio behind NAT

[John Smith]

The intended setup is as you described in option a. 

And the behaviour of rewriting SDP using private/public ports is what I understood the rtpproxy_manage was tasked to do.

As it is not working the way I expected, what is the best way to proceed? To check if the IP is from the outside and then rewrite via rtpproxy_offer in the NATMANAGE block?

Thank you

> ----- Original Message -----
> From: Klaus Darilion
> Sent: 01/21/14 05:25 AM
> To: Kamailio (SER) - Users Mailing List
> Subject: Re: [SR-Users] Kamailio behind NAT
> 
> On 21.01.2014 13:24, John Smith wrote:
> > I might be making wrong assumptions regarding this traffic flow. Is that correct?
> 
> That depends on your policy. It is up to you to define how RTP should be 
> routed. There are basically 2 choices:
> 
> a) RTP from clients is handled by rtpproxy:
> 
> phone1 <-nat-> rtpproxy <--> Asterisk <--> rtpproxy <-nat-> phone2
> 
> In this case, only the private IP of Kamailio and rtpproxy (can be the 
> same IP address) must be mapped to a public IP address.
> 
> 
> b) RTP directly to Asterisk:
> 
> phone1 <-nat-> Asterisk <-nat-> phone2
> 
> In this case, the private IPs of Kamailio and Asterisk must be mapped to 
> a public IP address.
> 
> 
> When using version a) you have to make sure to set the proper IP address 
> in the SDP. For example, SDPs in messages from Kamailio to the phone 
> must contains the PUBLIC IP of rtpproxy in the c=... line. SDPs in 
> messages from Kamailio to Asterisk must contain the PRIVATE IP of 
> rtpproxy in the c=... line.
> 
> regards
> Klaus
> 
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