Frank,
Ah, OK. That makes sense.
From an H.323 perspective, this kind of thing is
almost doable, but no remote device would be obliged to make
adjustments. One could send a Request Mode message and the receiver could
politely refuse. (Likewise, a SIP device could refuse an offer to
propose changes to established media flows.) The other issue is knowing
whether or not bandwidth needs to be adjusted or can be
adjusted. One might say that bandwidth could increase, because there is no
observed packet loss. But, perhaps an increase in bandwidth might then
disrupt some other service (e.g., other voice calls in progress). So, then
perhaps the bandwidth might be decreased to compensate. This then leads
one in a vicious cycle of bandwidth adjustments up and down.
And, as you rightfully point out, available
bandwidth is constantly rising and it will continue, since people want to
utilize services that require more bandwidth and want to use even more services
simultaneously. The 80Kbps voice call is really very little
compared to the Gbps of bandwidth most broadband customers have
today. Still, there are bandwidth-constrained locations, but the best
recommendation I could make is to simply select a lower bit-rate codec and use
that. Skype, for example, always uses G.729 for calls to PSTN gateways and
the sound quality seems very good to me.
Paul
----- Original Message -----
Sent: Monday, January 21, 2008 8:42
AM
Subject: Re: [h323plus] Dynamic Bandwidth
Management!!
Hi
i think he means the abillity to dynamically change
the codec during transmission to follow any changes in available bandwith.
I.e. when starting with g.711 and the available bandwith drops to 80kbits then
i.e. g.729 could be negotiated on the fly.
Actually a very nice feature but probably not very
easy to implement and more important, getting less and lesser important since
bandwiths are constently increasing almost all over the
world....
Frank
Abhishek,
H.323 Plus aside, what do you mean by "dynamic
bandwidth management"?
Paul
----- Original Message -----
Sent: Monday, January 21, 2008 4:44
AM
Subject: [h323plus] Dynamic Bandwidth
Management!!
Hi
Someone please help me with this.
I wanted to
know does H323+ does dynamic bandwidth management and mange the codec bit
rate accordingly?
How is it done.?? Where can I find the code
in RTP files in H323+ where bandwidth info is calculated?
Thanks