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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 -----
Sent: Wednesday, December 31, 2008
16:41
Subject: Re:
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 <mnhassan@xxxxxxx>
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,
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 -----
Sent:
Monday, December 29, 2008 10:14
Subject:
Re: 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
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