Abhishek,
I do not know what the H323 Plus software has, but
there are procedures defined for H.323 and facilitated with RTCP information to
help control bandwidth. For example, if packet loss is observed by looking
at RTCP reports, then an H.323 device could use the "flow control" command,
"request mode", or even close and open a channel that uses a lower bit-rate
codec.
The problem, though, is that while a mode shift can
be made to a lower bit-rate codec, there are dangers in doing the reverse.
I mentioned in my previous e-mail that what can happen is that devices get into
a constant state of increasing and decreasing bandwidth usage based RTCP
feedback.
One possible way to help mitigate that is to
utilize a Gatekeeper to allocate and revoke bandwidth to a terminal. This
works acceptable well, unless you have a network connection that is utilized by
other applications. And, in fact, most network connections are used by a
multiplicity of applications. As a consequence, using the Gatekeeper for
bandwidth management is often non-workable.
There are two tools to help address this issue, and
those are RSVP and DiffServ. We are presenting defining Recommendations
for the use of both RSVP and DiffServ within H.323 systems, with the initial
recommendations expected to be approved in May 2008. Using these tools
will generally work well if you can control the end-to-end network and/or your
service provider will provide some kind of service agreement and honor your
DiffServ packet markings accept RSVP requests and use DiffServ or other means to
increase the likelihood that your packets will arrive at the remote end as
desired.
In short, this is not a simple issue of H.323 or
any particular stack like H323 Plus or the IP link, but rather a whole system
problem that requires coordination and cooperation to work.
Paul
----- Original Message -----
Sent: Wednesday, January 23, 2008 1:09
AM
Subject: [h323plus] Dynamic Bandwidth
Management!!
Hi
By dynamic bandwidth management I mean that when a
video call is in progress , the bandwidth keeps on increasing or decreasing,
So does h323+ takes care of that and keeps the bitrate of encoder in control
by some means.Suppose encoder is producing more no of bits for a frame than
can be send on currnet available bandwidth. how does H323 deal with
that?