Problems calling a specific phone number

Discussion in 'General' started by jstraten, Feb 10, 2010.

  1. jstraten

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    I am using elastix for quite some time now and everything seems to work great. I can make great calls with excellent call quality.

    However, I am still having one problem that I simply can't resolve. Basically, my wife can't call her parents 90% of the time. I mean the call connects, but then you hear a lot of symmetric static noise (kind of like an up and down hiss). You can also hear each other, but the static noise is overwhelming and so you can't have a conversation.

    On the other hand almost every other call including my parents living in another country completes without any problem.

    Here is what I did so far:
    - Checked for packet loss; nothing, no lost packets
    - Provided 256kb up/down dedicated bandwidth in pfSense
    - Problem is there with or without pfSense

    Hardware:
    - Dedicated hardware for elastix
    - Dedicated hardware for pfSense
    - Rhino card with echo cancellation to connect local phones

    Internet connection:
    - Externally, elastix has a dedicated IP address that is routed to an internal IP using pfSense
    - Connection is 6000/768


    I am somehow suspicious that there is some kind of line noise that interacts with the echo cancellation. Bottom line is I need to resolve it somehow...

    The problem occasionally happens for other phone numbers as well, but it can normally corrected with another call. However, for other numbers it happens like 1 in 20 and for my wife parent's phone number it happens like 17 in 20.

    Any experts out there that have some advise for me?

    Thanks,
    Jens
     
  2. Patrick_elx

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    how are you connecting to your parents phone?
    via a sip provider? via a PRI? direct sip connexion?
     
  3. ramoncio

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    Hi jstraten, wellcome to the forum.

    How does your wife call her parents? I mean, which technology does the outside trunk use? SIP, IAX2, dahdi using analog/digital lines? This is the most important information you should have given, and also your telco/voip provider.

    Have you tried using a softphone, as Zoiper or Xlite, instead of the Rhino fxs ports? Does the problem persist? You could try that.

    Have you used fxotune with your fxo ports, in case you use dahdi+analog lines? This is important.
     
  4. jstraten

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    Thank you to both of you for getting back to me.

    I have a Rhino card with one module (2 ports) that is connected to my analog phone.

    Outbound calls are handled by a SIP provider (BroadVoice).

    I will install xlite for my wife and test again.

    Yesterday, I learned that is causing the problems (at my wife's parents home) is connected to a DSL filter. Now, I am suspicious that it could be a broken filter. Is it possible that a broken splitter could cause static noise that interacts with the echo cancellation?

    I also observed a light echo on normal calls. What is the best course of action to reduce that? Should I just reduce rx and txgain? Which is causing echo for me to hear?

    Please let me know if you need more information.

    Thanks,
    Jens
     
  5. jstraten

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    I am still trying to get some replacement DSL filters for their phones, but I have made one more observation. They can call us anytime without problems.

    Will try to test using a soft phone in the next few days.

    Cheers,
    Jens
     

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