extending analog pbx port

Discussion in 'VOIP' started by Henry Cabot Henhouse III, Dec 21, 2005.

  1. Hi --

    I'd like to extend an analog pbx station port from the office to my home.
    It should work like an off prem extension, that is when I go off hook at
    home, I should get pbx dial tone... when someone calls the extension, my
    analog phone at home should ring .

    I know there are a lot of boxes out there that do this, but they are
    hundreds if not thousands of bucks... I'm wondering if there's an
    inexpensive solution (as I'm paying for this on my own).

    Thanks in advance!
    Dave
     
    Henry Cabot Henhouse III, Dec 21, 2005
    #1
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  2. You can try a pair of Sipura SPA-3000's. One of the canonical
    examples they have in their FAQ's is how to set up the dialplan to do
    a "hotline". Eg. when you pick up one phone it automatically calls
    the some number. You can use that at the PBX-connected sipura to call
    your remote sipura whenever a call comes in. The remote sipura would
    be setup normally, with the pbx-connected one designated its outgoing
    sip gateway. For a bit of added simplicity I'd be sure to get two
    identical fxo/fxs units. You'll be screwing around with enough tricky
    settings in the units without having to worry about learning two
    totally different command sets. (There are probably other FXO/FXS
    units that can do the job too. I'm only familiar with the Sipura
    unit.)

    I have a SPA-3000 that I use to feed a POTS line into my asterisk
    (PBX). It works, but the reality of POTS lines is that it is
    impossible to feed them into a VOIP system without either causing a
    problem with reduced volume or if you crank the volume up, without
    introducing a bit of echo. If your pbx outputs a digital signal (PRI
    or BRI) this is probably the way you want to go. There are quite a
    few universities that have hooked their old PBX to either Cisco
    equipment or asterisk/SER and use SIP to connect things. In their
    case the goal is also to be able to connect to their PBX over the net,
    but only for the purpose of calling the users on their pbx. The
    setups should be similar enough that the configuration examples might
    prove useful.

    http://www.internet2.edu/sip.edu/

    -wolfgang
     
    Wolfgang S. Rupprecht, Dec 21, 2005
    #2
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  3. Hi ...

    I read a review of the 3000, and it stated that as the 3000's only support
    SIP, they have to register with a SIP server. The review also said that
    configuring the dial plan was not for the average teleworker.

    Do I have to use an outside SIP box to support these?

    Thanks
    Dave



    "Wolfgang S. Rupprecht"
     
    Henry Cabot Henhouse III, Dec 22, 2005
    #3
  4. I don't believe you will need an outside SIP server in order to make a
    simple "hotline" service. You only need to setup a call between the
    two units and they have enough smarts in the dialplan to do that
    themselves.

    It is nice to have an ntp server and dhcp server so the units will set
    the time automatically and set their IP addresses automatically, but
    even that, I believe, is optional.
    The dialplan itself is only part of the joy. It's only a one-line
    entry. The intimidating part is first seeing the pages and pages of
    other crap that you can configure (but for the most part, don't have
    to). It is not out of the realm of what someone interested in
    tinkering with technical things can handle. The biggest challenge is
    just not being scared away by the sheer number of entries that can be
    tinkered.

    -wolfgang
     
    Wolfgang S. Rupprecht, Dec 22, 2005
    #4
  5. gratias... the Sipura units are certainly in my price range... guess it wont
    hurt to try a pair.

    merry christmas / happy holidays!


    "Wolfgang S. Rupprecht"
     
    Henry Cabot Henhouse III, Dec 22, 2005
    #5
  6. Hi ...

    I emailed Sipra tech support... I received an answer in hours...

    Dear Valued Sipura Customer,

    Thank you for contacting Sipura Technical Support.

    Both SPA-3000's and the routers that are connected to need to have a static
    WAN ip address OR so you can always know your ip address. Your routers
    should be configured to allow the SIP ports 5060 and 5061 and foeward these
    two on your SPA-3000's and should be "SIP friendly". Enable Make and receive
    calls without registration on both SPA-3000's and set the User ID and SIP
    Port on line 1 and PSTN line to unique numbers on both SPA-3000's. Enable
    Voip and PSTN gateways on both spa's, spa2 - Enable VoIP Caller Auth Method:
    PIN, Define the VoIP Caller 1 PIN: This PIN will be requested when you want
    to gain access to the pstn line. At this point from the spa1 you can dial #2
    and the spa2 answer with some beeps (asking you for the PIN) then after you
    enter a correct pin, you will hear dial tone on the spa2.


    ***
    I take it from this I have to use a PIN to access dial tone from the pbx...
    is this for security?

    Thanks!
    Dave





    "Wolfgang S. Rupprecht"
     
    Henry Cabot Henhouse III, Dec 23, 2005
    #6
  7. Adding a PIN would be a way to prevent incoming (or outgoing) calls
    without the user touch-toning some a secret key. If you wanted all
    calls transparently relayed to the other side, I'd think you wouldn't
    really want this. Also, from a security standpoint, unless the PIN is
    very long (say well over 6 digits), it isn't going to do much to stop
    a computerized attack. It just isn't going to take that long for a
    computer to try all 3, 4 or 5 number PINS. Trying all 6 number PINS
    probably only takes a week or two.

    To stop a determined attacker from making outgoing calls via your pbx
    you'll want to add md5/http-digest authentication to the internet side
    of the pbx-connected sipura. Just choose 32 randomly chosen letters
    and numbers for your md5 password. Load that password into both of
    your sipuras and you should be safe enough.

    One thing I forgot to mention is there are a number of forums where
    folks that like to hack their sipura's hang out. Most of them seem to
    have thought about this sort of stuff for much longer than I have.

    http://voxilla.com/PNphpBB2.html
    http://forum.sipbroker.com/search.php?searchid=4811
    http://www.dslreports.com/forum/voip

    -wolfgang
     
    Wolfgang S. Rupprecht, Dec 23, 2005
    #7
  8. Henry Cabot Henhouse III

    Bill Kearney Guest

    To stop a determined attacker from making outgoing calls via your pbx

    Don't provide a way to do it. Seriously, if all you're doing is 'remoting'
    an extension then setup a fixed dialing plan for it. Such that all
    connections go to/from only the two fixed connections. You could setup the
    unit at the house to understand how to treat certain calls as local. But if
    this is work-related then you might just be better off using it as a second
    line on a two-line phone at home. That way anyone else in the house can
    pickup line 1 and use it as expected. Line 2 would be the work line and
    probably only available on certain extensions.
     
    Bill Kearney, Dec 23, 2005
    #8
  9. Henry Cabot Henhouse III

    Marc Popek Guest

    and the best way to join a voip and pstn service is the combine-a-line...
    the unit works all over the world and solves he problem of voip and pstn
    ports being in different places. you acan join al your favorite single line
    telco gear, like phone, answering system and even modem onto the combine
    a-line and then one side to voip and the other to pstn. then you have a
    powerful suite of tolls and automatic switching for your communication
    set=up..

    Marco
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5855131322&rd=1&sspagenam
    e=STRK%3AMESE%3AIT&rd=1
     
    Marc Popek, Jan 16, 2006
    #9
  10. Henry Cabot Henhouse III

    Marc Popek Guest

    Marc Popek, Feb 14, 2006
    #10
  11. Henry Cabot Henhouse III

    Marc Popek Guest

    Marc Popek, Feb 22, 2006
    #11
  12. Henry Cabot Henhouse III

    LVMarc Guest

    try this!

    http://cgi.ebay.com/ws/eBayISAPI.dl...00028438205&rd=1&sspagename=STRK:MESE:IT&rd=1


    COMBINE-A-LINE …… IMAGINE

    ….1=2


    Ever wish you could use your favorite single-line telephone, answering
    machine, or PC Modem on TWO phone lines?…. Automatically?

    OR

    How about joining your VOIP port and the plain old (PSTN) telephone
    jack into a single handset?

    OR

    How about joining TWO VOIP ports into a single handset, answering
    machine, or PC Modem?

    USE a CLT to join a card card acceptor and your single line telephone as
    well!

    OR

    see if anybody picks-up, on another line trunk, after you are already
    in a call??? A visual real-time security feedback feature!

    THEN...........................................

    Combine-A-Line (CLT) allows two separate calls from two different lines
    to be directed to your single line telephone equipment or PC.
    Centralizing and PROTECTING (SURGE PROTECTION INSIDE) your communication
    equipment for your home office or for the family
     
    LVMarc, Sep 18, 2006
    #12
  13. Henry Cabot Henhouse III

    LVMarc Guest

    try this!

    http://cgi.ebay.com/ws/eBayISAPI.dl...00028438205&rd=1&sspagename=STRK:MESE:IT&rd=1


    COMBINE-A-LINE …… IMAGINE

    ….1=2


    Ever wish you could use your favorite single-line telephone, answering
    machine, or PC Modem on TWO phone lines?…. Automatically?

    OR

    How about joining your VOIP port and the plain old (PSTN) telephone
    jack into a single handset?

    OR

    How about joining TWO VOIP ports into a single handset, answering
    machine, or PC Modem?

    USE a CLT to join a card card acceptor and your single line telephone as
    well!

    OR

    see if anybody picks-up, on another line trunk, after you are already
    in a call??? A visual real-time security feedback feature!

    THEN...........................................

    Combine-A-Line (CLT) allows two separate calls from two different lines
    to be directed to your single line telephone equipment or PC.
    Centralizing and PROTECTING (SURGE PROTECTION INSIDE) your communication
    equipment for your home office or for the family
     
    LVMarc, Sep 18, 2006
    #13
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