By Colman Carpenter; Ian Plain; Jared Smith; Philippe Lindheimer; et al
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Extra resources for Asterisk 1.4 : the professional's guide : implementing, administering, and consulting on commercial IP telephony solutions
So what level of latency in a system can be deemed to be acceptable? It's well documented that the human ear can detect delays in audio above 300 ms, so if there is latency greater than 300 ms, the user will hear an audible delay or even an echo. Why? Back in days of yore, telephone engineers found that they needed to feed what you were saying back into the ear piece, a feature known as sidetone. If they didn't, then the user would think they'd been disconnected. Of course, traditional PSTN systems, with their inherent low latency, only had an issue when large distances were involved.
To illustrate, a system has been set up for a charity in the UK that had 75 agents placing thousands of calls a day on just eight broadband circuits. 2 - it’s operation cannot be guaranteed in other versions. Configuration overview Once the circuits are delivered, you will end up with four routers connected to the broadband service of your choice. Each router will have a unique IP address. Com This material is copyright and is licensed for the sole use by Anna Indahl on 12th August 2009 PSC 94 Box 361, , APO, , 09824 Chapter 1 We will also assume that the VoIP ITSP has multiple IP addresses that you can connect to, though if not, you can probably do some clever address translation in the routers.
Firstly, our supplier reduces the cost of UK 0870 numbers to free in the evenings as has happened in the UK with BT(British Telecom). Secondly, we also want the shop floor phone (1099) to be able to dial extensions and toll free calls, but not change the dialplan for 1098. We will deal with the simplest of these extensions (1099) first. All we need to do is change the context associated with this user to a new context called [freeuser]: [freeuser] include => include => include => include => free_num ; allows calls to free numbers internal_num ; allows the calling of extensions emergency ; allows calls to the emergency services default ; allows access to system features .
Asterisk 1.4 : the professional's guide : implementing, administering, and consulting on commercial IP telephony solutions by Colman Carpenter; Ian Plain; Jared Smith; Philippe Lindheimer; et al