Thank Gang Liu for showing interest into the topic and responding. I had
already gone through that wiki before I sent the email, and was a little
confused, and am even now. The Signalling Proxy mode, to my understanding,
normalizes a lot of protocol directives. For example, after reading through a
lot of mails in this mailing list, I had the impression that GnuGK can
sometimes talk to endpoints that are a bit deviant than H323 protocol.
Protocol conversion is something that GnuGK can't do. The SBC concept also
seems to have stemmed from the SIP stack. Another feature that SBCs seem to
have is having ability to route media to different endpoints than the
signalling endpoint, making it possible to do CALEA or LI.
Thanks for your Ideas once again. I hope some other guys over here could also
share their understanding on the issue.
Regards
HASSAN
----- Original Message -----
From: Gang Liu
To: GNU Gatekeeper Users
Sent: Wednesday, December 31, 2008 16:41
Subject: Re: [Openh323gk-users] Theoretical Question - SessionBorderController
GNUGK could work as signaling gateway and relay RTP streams. And most time it
is good.
But It works in signal proxy mode. mostly SBC productions in the market have
much more features.For example, fix or change protocols and protocol syntax to
achieve interoperability. I have a case before, some devices must work in
normal start mode, but the other only can support fast-start mode.
If u refer gnugk as a SBC, then I think it isn't a full features SBC.
You can take a look at this
http://en.wikipedia.org/wiki/Session_Border_Controller
regards,
Gang
On Mon, Dec 29, 2008 at 3:03 PM, Nyamul Hassan <[email protected]> wrote:
Thank you Gang for your input here. According to the Wikipedia page on
B2BUA:
The Back-to-Back User Agent (B2BUA) acts as a user agent to both ends of a
Session Initiation Protocol (SIP) call. The B2BUA is responsible for handling
all SIP signalling between both ends of the call, from call establishment to
termination. Each call is tracked from beginning to end, allowing the operators
of the B2BUA to offer value-added features to the call.
and,
A Signaling gateway, part of a Session Border Controller, or Asterisk PBX
are good examples of a B2BUA.
The last statement particularly puts me off, as the SBC page on Wikipedia
also suggests that "Signalling Mode" GnuGKs also function as a partial SBC. Is
this correct? Or am I missing something?
Regards
HASSAN
----- Original Message -----
From: Gang Liu
To: GNU Gatekeeper Users
Sent: Monday, December 29, 2008 10:14
Subject: Re: [Openh323gk-users] Theoretical Question - Session
BorderController
I don't think gnugk is a SBC. For example, can one peer in normal start
mode and the other call leg in fast start? mostly, SBC is a B2BUA.
regards,
Gang
On Sun, Dec 28, 2008 at 10:39 PM, Nyamul Hassan <[email protected]> wrote:
Hi,
I have a theoretical question about the difference between a Session
Border
Controller and a Soft Switch. Going through some googled documents, it
appears there is very little difference between the two. It appear
GnuGK
can work as an SBC for H323 endpoints. Am I being wrong in making this
assumption? Can someone shed some light on this issue?
Regards
HASSAN
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