Jon,
I actually had some more discussions with Tim on this issue, and it seems that the channel bank would still be a good option to choose for internal purposes. I would not see any other solution than a channel bank to connect many 2wire phones into one asterisk box. I had a talk today with Carrier Access, and it seems that the adit would do us fine. The fxs cards of the adit 600 are actually reprogrammable for uk phones (dip switches). We have requested a test platform from CAC which I hope would arrive here shortly, and we would test how the fxs ports work with different uk phones.
I would really be unhappy to scratch our existing phone cable network and to lay an entire new LAN and to buy many IP phones. First of all - new installations always have teething problems. Then the admin headache with the many IP phones. Also - the solution doesn't scale very easily. For each new phones we need a new network socket... or a hub. Then one mains connection per phone (with power supply - more fire risk). And on and on... Using 2wire phones eliminates all that - cables are there already, users can buy any phone they like, we can put in additional sockets without admin effort and so on. Really - 2wire rocks!
The pstn connectivity is an entirely different matter. The fxo cards of the adit600 seem not to be EU approved for public ( = pstn) connection (mainly) because of emission regulations. Also, I would not be sure how well the impedances of the fxo ports and the BT lines match (Echo problem, noise etc.). I am looking into using a voip gateway with fxo ports for our BT line connectivity. I found one on sale on a UK website, see
http://lists.digium.com/pipermail/asterisk-users/2004-November/075118.html
However, it looks to me more and more that for our internal phones we use the adit 600. Lets see what the testing will show...
Peter
On Thursday 18 November 2004 22:16, Tim Robinson wrote:
Channel banks are a peculiar US thing. Be careful! You will almost certainly be better off using voip handsets (SNOMs are cool, avoid Grandstream for anything other than domestic environment) and a few Sipura-type ATA's for the analogue fax machines etc. or some Digium analogue cards.
So what would you advise using in the UK to interface with standard 2 wire phones - I'm trying to avoid having to use ata type adapters.
Jon
-- There are 10 kinds of people in the world, those who understand binary, and those who don't.
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