6 Oct
2005
6 Oct
'05
4:31 p.m.
But what if the caller is on the public internet and it wants to talk
to someone behind a NAT?
In this case, how will a media proxy forward the call to the NATed
client if in this case the NATed will be waiting for RTP traffic?
Tha NATed UA will send the 200 OK and then the caller party will send
traffic to a media proxy and this media proxy needs to send RTP to the
NATed UA....
I know this may be getting boring, but I am trying to understand how
it works.....
Felipe
On 10/6/05, Nils Ohlmeier <lists(a)ohlmeier.org> wrote:
If one side of the connection is on the public
internet and the other one
behind NAT you do not need a RTP proxy in all cases.
But if both parties are behind NAT then you have a classical chicken-egg
problem. For that scenarios you defiantly need a relay in the public
internet.
Nils
On Thursday 06 October 2005 13:17, Felipe Louback wrote:
--
Master Student - Electrical Engineering Department
Computer Engineering and Telecommunications Research Group
Universidade Federal de Minas Gerais - Brazil
"For God so loved the world that he gave his one and only Son, that
whoever believes in him shall not perish but have eternal life."
John 3:16
well, if after the NATed UA receives the 200 OK
it has to start
sending RTP and it is symetric(sends and receive data throught the
same port), then there is no need of a media proxy, since the called
part knows from which port in the NAT box the NATed UA is using...
I am getting confused about why I need to use a media proxy....
Felipe
On 10/4/05, Felipe Louback <louback(a)gmail.com> wrote:
--
Master Student - Electrical Engineering Department
Computer Engineering and Telecommunications Research Group
Universidade Federal de Minas Gerais - Brazil
"For God so loved the world that he gave his one and only Son, that
whoever believes in him shall not perish but have eternal life."
John 3:16
after the
UA, which send the INVITE, received the 200 OK for the INIVTE
it has to start sending RTP.
uhm..... I didn't know that. That is a very good explanation. If it
has to start sending RTP, then the media proxy now knows what port it
is using in tha NAT box. I thought that after the 200 OK, the nated UA
would wait for audio to come, since it sent all the parameters in the
SDP body.
Thanks for the explanation.
Felipe
--
Master Student - Electrical Engineering Department
Computer Engineering and Telecommunications Research Group
Universidade Federal de Minas Gerais - Brazil
"For God so loved the world that he gave his one and only Son, that
whoever believes in him shall not perish but have eternal life."
John 3:16