August 1999
Intermediate to advanced
328 pages
8h 50m
English
Content preview from Voice Over IPBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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PACKET SIZE, BUFFER SIZE, LOSS, AND LATENCY
The VoIP designer must pay attention to buffer sizes, packet sizes, and the packet loss rate. The larger the packet loss, the worse the audio quality will be at the receiver. On the other hand, large packet sizes increase the delay and so do large buffers. To see why, let us examine a simple G.711 64 kbit/s voice signal.
First, consider the loss of user traffic. The size of the packet is quite important for speech because of the concept of packet length (the duration of the packet on the channel). Packet length is a function of the number of user bits in the packet, and the coding rate of the signal (for example, 64 kbit/s). Studies reveal that losing traffic that is around 32–64 ms (for G.711 traffic) ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.