Considering default payload of 20 bytes, VoIP over Ethernet, no compression: Codec sample size of 10 Bytes and sample interval of 10 ms: Voice Packet per second = 1/byte size/sample size*sample interval*1000 = 1/20/10 / 10*1000 = 50 PPS
Total Packet size = IP+UDP+RTP+Enet+Payload=20+8+12+18+20= 78 bytes So Bandwidth per call = 78*bits * 50 PPS = 31200 = 31.2 Kbps *If you don't consider L2 overhead, then it comes down to 24 Kbps (each way). Hope it helps. Nadeem -- ==================== Ishrat Nadeem Zahid CCNP Cisco Systems,Inc. Chelmsford, MA 01824 > Hi, > > Just a simple question. > If I make a g.729 VoIP call over a 128K Serial link how much bandwith do I > need? (20 bytes/packet, no VAD, cRTP,....) > Am I right that I have to count two voice streams when provisioning VoIP? > A speaker --> B listener > A listener > So, is it around 11kbps or 22kbps? > > Attila Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=35652&t=35103 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
