Cordless phone not hanging up Sipura SPA 2000

Discussion in 'VOIP' started by npne, Feb 27, 2005.

  1. npne

    npne Guest

    Just got a Doro 830r DECT cordless phone to go with my SPA 2000. The
    cordless works fine on the Telstra (Australian Telecom) landline. The
    Sipura also works fine with a very old Telstra handset, which by the way
    is the only phone I have tried with the SPA 2000.

    When I use the Telstra phone (wired) the status light goes off on
    hanging up and comes on when I pick up the phone off the hook.

    When I connect the cordless instead, the status light stays on, whether
    I pick up the phone or not. The first time that I press the talk button,
    I can get a dial tone and call out, however when I hang up by pressing
    the talk button again, the call does not hang up.

    Can I set something on the Sipura to make it recognize the hangup from
    the cordless?

    The manual for the DORO 830R is available at under
    Customer support.

    Thanks for your help.
    npne, Feb 27, 2005
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  2. npne

    Ivor Jones Guest

    What have you got the impedance of the FXS ports in the SPA-2000 set to..?
    I don't know what the standard is in Australia, but here in the UK it's
    270+750||150nF while the default setting on the Sipura is the US standard
    of 600 ohms. Try changing that setting (it's on the regional tab) to your
    local standard (your telco should be able to tell you what it is) and see
    if that makes a difference.

    If not, it may be a fault with your cordless phone.

    Ivor Jones, Feb 27, 2005
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  3. npne

    Franc Zabkar Guest

    "In 1993 Austel started insisting that subscriber equipment should
    present a complex impedance to the local loop instead of the former
    purely resistive 600 Ohm impedance. The complex impedance is called
    "TN12" and consists of 220 Ohms in series with a parallel combination
    of 820 Ohms and 120 nanofarads."

    - Franc Zabkar
    Franc Zabkar, Feb 28, 2005
  4. npne

    npne Guest

    Have set the impedance of the SPA 2000 fxs port to 220+820||120nF but
    that didn't fix the problem.

    The problem seems to lie in the coil resistance, as soon as I plug in
    the cable of the cordless, the SPA detects off hook condition. As the
    ring and tip current is DC, I wouldn't have thought impedance would make
    a difference.
    npne, Mar 2, 2005
  5. npne

    Ivor Jones Guest

    Sounds like a phone fault then. Try another cordless phone if you can.

    Ivor Jones, Mar 2, 2005
  6. npne

    Franc Zabkar Guest

    With all phones/faxes/modems disconnected, measure the voltage between
    tip and ring at the wall socket. After connecting the cordless phone,
    this voltage (~52VDC) should not drop appreciably, if at all. If you
    now take the phone offhook, this voltage should drop to around 20V.

    - Franc Zabkar
    Franc Zabkar, Mar 2, 2005
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