Help with ISDN and PBX equipment needed ?

Edwards Finance > Phones

Q. I am considering changing my phone line to BT's Business Highway and am concerned about the compatibility of my present PBX equipment (Omnicom 2828), which I have had a for some time, but neither BT or the equipment manufacturer can assure me that it will work OK, each saying to check with the other. The PBX has two normal telephone input lines which I thought to plug into the analogue sockets of the terminal box and run a digital line to the computer, I would then be able to run the 7 phones on the PBX as usual and I cannot see why this would not work but I hope that someone in this group may have experience of such a setup. Also can anyone tell me how much improvement I can expect to see over a 56k modem on internet.

A. If the makers of the switch haven't tried it you need some one else who has an confirm it works (or not). In theory it should work as you say, The Highway box is supposed to be exactly the same as a real POTS line but obviously isn't (Brother FAX machines...) Noticeable and worthwhile without compression on the ISDN link. Uncompressed ISDN doesn't exactly knock spots of V90 (normal connect at 44k) but it is most definately quicker. I get sustained 7k Bytes/s on all file transfers, ie the pipe is full. BT will tell you (for some reason) that you cannot use a PBX on Highway, but you can. Bear in mind that if it connect to the Highway analogue ports, then it will take calls ONLY on your two analogue phone numbers, not your 'digital' numbers (or MSNs). If you have ISDN2e, then you will need a TA of some kind to provide the D to A conversion. Yes, they gave me that bull$#!t as well, until I asked them what they provide MSN for if not a PBX! They couldn't think of another reason for having MSN, so reluctantly concluded that PBXs _must_ be supported (but presumably only on BH, as they won't supply MSN on HH). I only want to use the PBX on the analogue ports and keep the digital for the computer, so I could not see why it would not work, but got a little uneasy when everyone seemed so reluctant to say it would work. I use the PBX all the time for internal calls and would hate to lose it. But initially they said that _any_ pbx was unsupported on BH, and it was only when I queried what the MSNs were for that they accepted that a pbx must be OK.

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