Re: [OpenSIPStack] Questions Regarding RTP communication in openSBC

[Joegen E. B. <joe...@gm...>]

Ashish Khare wrote:
> Hi Joegen,
>
> I have two questions for RTP communication in openSBC.
>
> 1) clients have to use the same RTP ports to send the RTP packets on which
> they recieve RTP packets. So if the client is recieveing RTP packets on port
> 8000, Cient will use 8000 only to send the RTP packets?
>   

Most implementations do this, yes.  In fact this behavior is needed for 
OpenSBC NAT traversal to work.


> 2) When natted client initiated the call,  for example Client A which is
> behind a NAT, calls B through openSBC, the first RTP packets need to be
> recieved from Client A, at openSBC, in order to send the RTP packets from
> Client B to Client A. this is because of NAT device, the RTP packets from A
> comes from different port than what was said in the SDP offfer and therefore
> RTP packets from B need to be send to this new port.  is my understanding
> correct. Please clarify.?
>
> Please reply.
>   


Yes, this is exactly how its done in OpenSBC.


> Thanks.
>
> -Ashish
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