September 2008
Intermediate to advanced
550 pages
18h 10m
English
Content preview from VoIP Voice and Fax Signal ProcessingBecome 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,
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.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.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.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.
17.3 CALL PROGRESS TONES FOR MULTIPLE COUNTRIES
This section is presented with the electrical characteristics of various tones used in PSTN or VoIP services. In telephone service, the outcome of communication would be either visual or acoustic. Most actions in the telephone are audible acoustic tones and speech. The tones are known by name call progress tones (CPTs) as they represent the progress of the call. The tones in different countries and regions will vary. Some basic tones such as dial tone, busy tone, ring back tone, congestion tone, and call waiting tone are given in E.180 [ITU-T-E.180/Q.35 (1998)] for most countries. Many extended tones are available in local PSTN standards, for example, [URL (NTT-E)].
The most popular visual information on a phone are message waiting indicators, caller ID, call wait ID display, any light blinking associated with off-hook, ring, or call progress indication. Some phones with sufficient size display may also display dialed digits, date, time, and new call indication through selected symbols in the same screen of caller ID display.
17.3.1 Basic Call Progress Tones
Most tones mentioned in this chapter are applicable to both the PSTN and VoIP. In the case of the PSTN, a central office will deliver these tones. In VoIP, the VoIP adapter in association with call control signaling delivers the tones. These tones are given in a generic way. Specific details have to be noted from country-specific PSTN standards and E.180. The basic tone parameters ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.