Call bleeding - hearing other calls

Discussion in 'General' started by vtofa, Mar 13, 2009.

  1. vtofa

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    We have a few users complaining that they hear other calls faintly in the background when they are talking to a caller. What could be causing this? How would one troubleshoot it?

    Elastix 1.3
    Sangoma A400DX with 8 POTS lines
    Aastra 9143i phones (mostly)

    Thanks
     
  2. dicko

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    It has to be in the PSTN circuitry, probably the wiring, are you sure there are no "split pairs" dampness or other resistive/inductive paths between your lines?

    The analog world uses a "toner/amplifier" pair which injects a signal into a pair and listens by induction on the wiring, a simple analog line can help a little,while a call is "active" put it on an "inactive" line, go off hook and dial something (maybe a 2) to "break dial tone, if you hear anything else but silence than suspect "coupling" between pairs. The wiring should be as clean and as short as possible from the point the telco hands it off to you to your equipment.
     
  3. vtofa

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    Thanks Dicko,
    You were right on. It turned out that this had been happening even in their old analog phone system. They had a wiring mess, that needed cleaning.
     

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