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Resources for how to set up a wireless voip mobile phone network

Posted on 2006-06-07
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I am looking for some online technical guides / resources on how to set up a mobile VOIP network. I am hoping to run a demonstration project in the small islands developing country where I live, which has no mobile coverage outside the capital, and a 15 year exclusive license holder as the only service provider preventing competition and innovation. Initially it would be a closed local loop as we are not allowed to connect to the PSTN and the villages are very remote anyway, with no telephone coverage at all.

I am ssuming it's just a case of setting up some APs around the village with some sort of management server hooked up somewhere, to map IP addresses to phone numbers etc. We want to make it look just like a normal mobile service, even if it will not be joined to the PSTN, as this is a demo project to try and convince the telecom authority.
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Question by:leemingd
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by:grblades
ID: 16851139
I would recomend installing a central computer running Asterisk (http://www.asterisk.org/ and http://www.voip-info.org/wiki-Asterisk). This will be the central PBX which all the phones will register with.

You would then need a series of wireless access points. There are a limited number of 'channels' which can be used so they will need to be setup with powerfull antennas to get a long range and the channels used configured in a pattern such that there are no two adjacent access points sharing the same channel.

Wireless devices dont handle roaming between access points very well. When the phone switch from one access point to another it will re-register with the server and immediatly be available to make and receive calls. One thing you wont be able to do however is switch between different access points during a call.
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by:leemingd
ID: 16857720
Good advice, thanks. One clarification, we want to avoid hardwiring for the APs. Are there any issues with having them communicate with each other as a mesh network?
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grblades earned 375 total points
ID: 16859390
A mesh network is ok as long as you keep the number of devices low. The problem with a mesh network is that any data anyone transmits onto the network gets sent everywhere onto all the separate wireless access points. This is becuse you normally set the access points up to bridge traffic netween them.
You might be able to find access points designed to work in a mesh enviroment and learn about all the devices which have connected via other access point bridges and only send the traffic to a specific access point if they know the destination device is there. This is basically how network switches work.
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