Hi Julian,
You can still handle the NAT wih COMEDIA even for T.38, but you have to
handle the re-INVITE also . In your scenario, who is generating the
re-INVITE?
Regards,
Bogdan
Julian Yap wrote:
The full story is that I was looking to get T.38 working behind NAT.
Unfortunately, no matter
In an example scenario, the re-INVITE is handled by the end device.
So:
PSTN Fax -- GW -- OpenSIPS -- UA (ATA attached to Fax machine)
UA answers the call and then sends the re-INVITE which is correct as
that is the terminating side.
I read this RFC
Hi Julian,
That is cool - in this way you save a lot of bandwidth and processing
power with media relaying.
Regards,
Bogdan
Julian Yap wrote:
Hi all,
I eventually played around with the Audiocodes box and enabled some
settings so it worked with Comedia support.
Thanks,
Julian
On
The full story is that I was looking to get T.38 working behind NAT.
Unfortunately, no matter what I tried, it wouldn't work behind NAT. I
had the initial INVITE (G.711) working fine but when there was the
T.38 re-INVITE, the RTP media would connect up fine but just wouldn't
negotiate properly
2009/2/10 Johansson Olle E o...@edvina.net:
If both devices are on private IP's, there's going to be two
RTP proxys involved if they're on different SIP networks.
Each SIP service needs an RTP proxy for supporting their
local users.
Hi, I don't fully agree on it:
alice --- (NAT A) ---
10 feb 2009 kl. 13.10 skrev Iñaki Baz Castillo:
2009/2/10 Johansson Olle E o...@edvina.net:
If both devices are on private IP's, there's going to be two
RTP proxys involved if they're on different SIP networks.
Each SIP service needs an RTP proxy for supporting their
local users.
Hi, I
2009/2/10 Johansson Olle E o...@edvina.net:
alice --- (NAT A) --- ProxyA RtpProxyA --- ProxyB RtpProxyB ---
(NAT B) --- bob
In this case, when alice calls bob, ProxyA will apply RtpProxyA so the
SDP will contain a public IP.
Since ProxyB knows that bob is registered behind NAT, it will
10 feb 2009 kl. 13.44 skrev Iñaki Baz Castillo:
2009/2/10 Johansson Olle E o...@edvina.net:
alice --- (NAT A) --- ProxyA RtpProxyA --- ProxyB RtpProxyB ---
(NAT B) --- bob
In this case, when alice calls bob, ProxyA will apply RtpProxyA so
the
SDP will contain a public IP.
Since ProxyB
2009/2/10 Johansson Olle E o...@edvina.net:
No, that's not an excuse. RtpProxy must be applied in both the request
and response.
If a PSTN gateway calls a SIP user behind NAT, you must apply RtpProxy
even if the incoming SDP has public address.
Not in the INVITE sdp - the device behind the
Hi Olle,
Johansson Olle E wrote:
10 feb 2009 kl. 12.25 skrev Iñaki Baz Castillo:
2009/2/10 julianok...@gmail.com:
You don't know if RtpProxy should be running, does it mean you are
trying to use it or not? I don't want to spend time inspecting what
you want to do by reading your config,
Thanks all. I'll check to see if the AudioCodes gateway does have
comedia support.
That clarifies some half baked NAT/RTP knowledge in my head.
- Julian
On 2/10/09, Bogdan-Andrei Iancu bog...@voice-system.ro wrote:
Hi Olle,
Johansson Olle E wrote:
10 feb 2009 kl. 12.25 skrev Iñaki Baz
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