Re: [OpenSIPStack] Questions Regarding RTP communication in openSBC

[Ashish K. <ash...@gm...>]

But then in second case
does it will pose a security threat  ?
Because anyone can spoof an IP address and sends the RTP from different port
?



On 9/5/07, Joegen E. Baclor <joe...@gm...> wrote:
>
> 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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