erol turac wrote:
> how can proxies edit c line in sdp? which rules can be applied to c line by
> proxies?
>
> I have a sip client behind nat which insert its own private IP at session
> level (c line under m line)
> and NAT adds its own public IP into c line at media level before forwarding
> 200 OK to proxy.
> Here, proxy removes c line at media level and forward 200 OK to ingress side
> with private IP at session level.
> Is it valid behaviour for proxies?
No. Proxies are not permitted to alter the body of a message.
Paul
> On Thu, Jan 1, 2009 at 1:22 AM, Dale Worley <dwor...@nortel.com> wrote:
>
>> On Tue, 2008-12-30 at 22:37 +0800, Serbang, Nabam (Nabam) wrote:
>>> So how u1 knows where to send RTP packet. Usually it will send to
>>> address present in Contact header.
>> U1 will *never* use the IP address in the Contact header to determine
>> where to send RTP packets, it will use the address in the 'c' line of
>> the SDP it receives.
>>
>> There are problems ensuring that each UA will receive SDP that contains
>> 'c' lines that contain usable addresses for SDP. ICE can be used by the
>> UAs to decide what addresses to use. Alternatively, the proxies
>> involved can edit the SDP to correct the 'c' lines in the presence of
>> NATs.
>>
>> Dale
>>
>>
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>
>
>
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