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How do you do....it? Thread, Anyone have any experience with purchasing telecoms? in Technical; Originally Posted by torledo Our of interest how are you connecting to the pstn with that system ? All or ...
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    localzuk's Avatar
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    Quote Originally Posted by torledo View Post
    Our of interest how are you connecting to the pstn with that system ? All or part of an ISDN30 or multiple isdn 2's ?
    We have a TDM400B card which connects to 3 standard lines. (And I have 2 spare cards, just in case).

    The main issue with analogue lines is the time you have to spend tuning each port of the card to the individual line it is connected to, in order to reduce echo but get the best volume.

    If you can go with PRI or BRI lines then do so, they are much less hassle to get set up.

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    sdc
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    We did this at a school I worked in previously - it was my project. We replaced an ancient Apex 64 system which had suffered badly from a couple of lightning strikes. After a reasonable amount of investigation, I went for a Panasonic system. They're incredibly reliable, very cost effective, simple to use and program (you get complete control if you want it) and enables you to have nice fancy phones or standard two-wire handsets, or a mixture of both (depending on the system model you go for). The Panasonic was also the most cost-effective solution.

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    speak to Vocera or World Wide Solutions (reseller) - they do a very cool system - highly recommended!

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    I like for Small needs the BT Versatility's, they are great little systems and take ISDN30 as well as 2E and PSTN. They will do up to 40 extensions and can do VOIP lines and handsets as well.

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    Quote Originally Posted by localzuk View Post
    We have a TDM400B card which connects to 3 standard lines. (And I have 2 spare cards, just in case).

    The main issue with analogue lines is the time you have to spend tuning each port of the card to the individual line it is connected to, in order to reduce echo but get the best volume.

    If you can go with PRI or BRI lines then do so, they are much less hassle to get set up.
    30 extensions and just 3 lines ? Is that working out alright, that sounds a little light on the trunk side to me.

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    Yeah, standard PSTN lines....so surely that only gives you 3 simultaneous calls in/out of the premises? Or do I have this wrong??

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    Correct Joe, 3 Analoge Lines = 3 calls max either in or out or a combination of the two types up to a toal of 3 calls. TBH you'd be surprised at how few you do need though, I think we only have about 10 lines for 100ish extensions and its not that often that I get a no outside line avalable.

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    You wouldn't know I spent 12 weeks doing an IP Telephony course would you?

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    Yep, we have only 3 lines. (well, 5, but 1 is dedicated to a fax, and 1 is dedicated to a payphone). We do have quite a few busy signals but my boss isn't willing to get any more lines. I think the ideal number for us would be about 5 lines, with one dedicated to voicemail to get rid of people quickly when the rest are busy.

    There are only about 15 people who are at desks nearly all day though, the rest are spread around the school, so are rarely used.

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    We only have 32 lines (2 x ISDN) and about 500 extensions - most of our calls are internal so it mostly works well.

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    hows that work I thought ISDN was always a 2 channel product unless it was ISDN30 which you buy in more as you need over about 6 or 8 (can never remember which) its more cost effective and flexible than ISDN2E

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    Think about it John... what's 30 + 2?

    I'm assuming one is ISDN30 and the other is standard ISDN.

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    Quote Originally Posted by Joedetic View Post
    Think about it John... what's 30 + 2?

    I'm assuming one is ISDN30 and the other is standard ISDN.
    Or it could just be 2 ISDN30's...

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    Just not fully utilized.

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    Quote Originally Posted by john View Post
    hows that work I thought ISDN was always a 2 channel product unless it was ISDN30 which you buy in more as you need over about 6 or 8 (can never remember which) its more cost effective and flexible than ISDN2E
    ISDN30 starts with a minimum of 8 channels so i'd imagine it increments in 8's rather than 6's until you need to go from 24 to 30.

    steve is actualy in a good positin having two isdn30's of 16 channels each (or one with 24 and the other with 8) however it's carved up....it's not horrifically expensive and he has room for expansion without having to provision brand new lines.

    I personally woud jump striaght into the minimum isdn 30 product if i needed more than 4 channels on the trunk side....as you say more flexible and cost effective, i'd feel 2 line/4 channels is the most i'd go to with 2e...anything beyond that i'd make the case for the 8 channel isdn30 product.
    Last edited by torledo; 16th May 2008 at 06:39 AM.

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