I am using G729A. I was expecting a maximum bandwith requirement of 24Kbps (8Kbps for voice, 16Kbps for IP overhead), however when I measure the actual usage, it comes around 30 to 32 Kbps. What happens? Thanks, -- sudhir
I believe that is due to a packet sizing issue. The g.729 codec likes to make a whole bunch of small packets to reduce voice latency. This has the unfortunate side effect of increasing overhead to a level that is above what you would think. More packets=more overhead On 13 Jul 2004 15:36:28 -0400, Sudhir Kumar <sudhir1@adelphia.net> wrote:> I am using G729A. I was expecting a maximum bandwith requirement of > 24Kbps (8Kbps for voice, 16Kbps for IP overhead), however when I measure > the actual usage, it comes around 30 to 32 Kbps. What happens? > > Thanks, > -- sudhir > > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
Sudhir Kumar [sudhir1@adelphia.net] wrote:> I am using G729A. I was expecting a maximum bandwith requirement of > 24Kbps (8Kbps for voice, 16Kbps for IP overhead), however when I measure > the actual usage, it comes around 30 to 32 Kbps. What happens? >The 8k is each way, so that makes 16k for voice. -- _/ _/ _/_/_/_/ _/ _/ _/_/_/ _/ _/ _/_/_/ _/_/ _/ _/ _/ _/_/ _/ K e v i n W a l s h _/ _/ _/ _/ _/ _/ _/ _/_/ kevin@cursor.biz _/ _/ _/_/_/_/ _/ _/_/_/ _/ _/
Sudhir Kumar wrote:>I am using G729A. I was expecting a maximum bandwith requirement of >24Kbps (8Kbps for voice, 16Kbps for IP overhead), however when I measure >the actual usage, it comes around 30 to 32 Kbps. What happens? > > >At 20ms sample time you should be seeing 24-26Kbps(each way). We have measured this many times before. I suggest you use Ethereal to see what else is traveling in the wire. If you use 60ms then it drops to 13-14 Kbps (each way), unfortunately this is not possible with Asterisk since it forces you to 20ms.