[Solved] Strange sound when calling SiteC / Branch2

Not always but often enough to make a post - when i call remote Site C, doesnt matter if its in Netherlands or Abu, i get a very strange and LOOOOUD ringback tone. I cannot pinpoint this down so that i can reproduce it.

I remember having the same issue during the Bootcamp but forgot to force Mark to answer ;)

Yesterday for example, i had this problem when calling from SiteA to SiteC but not when i called from SiteB to SiteC.

What network related parameters are there to check? DP/Phone Network locale. CP Tone and Compand-type on the CLI/Router comes to mind.

They were pretty much identical (SiteA/B) and yet they made this funny sound. The call itself was fine from a quality point of view, its just the ringback that is very strange and loud. It is not possible to mute this ring tone, even at the lowest setting, its still very loud.

Im just afraid during the real lab that i will piss everyone off when i do my test calls ;)

Any hints are appreciated.

Comments

  • This is a problem with the compand-type, try making Branch2 ulaw and see if that solve the noise issue. Eventhough you are using an E1 when you connect the call if you look at the codec is g711u. below is a link for that command reference:

     

    http://www.cisco.com/en/US/docs/ios/12_0/voice/command/reference/vrvpcmds.html#wp1032699

     

  • I did - didnt change

    Am 26.12.2012 um 14:50 schrieb miguel <[email protected]>:

    This is a problem with the compand-type, try making Branch2 ulaw and see if that solve the noise issue. Eventhough you are using an E1 when you connect the call if you look at the codec is g711u. below is a link for that command reference:

     

    http://www.cisco.com/en/US/docs/ios/12_0/voice/command/reference/vrvpcmds.html#wp1032699

     




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  • Sorry was typing from the phone - so here is my long answer ;)

    I played with the compand-type. I noticed that sometimes the voice quality was very bad and Mark told me to check it out. Sure enough that fixed the quality of the sound/audio. My issue though is the ringback tone when i call the phone, aka rtp not up yet.

    What's really odd however is that i only had this problem when calling A -> C, but not when calling C -> B. I will try to test it more tomorrow should it happen again.

    Thanks for the link!

  • Sounds good. I've had that issue in the past and the companding type command fixed it for me.

  • Falko -

    What type of protocol are you using on the gateway for Site A? Is it different from Site B and Site C? Ringback audio will be generated locally until the RTP stream is setup and caller voices are being passed back and forth.

    Matthew

    On Dec 26, 2012, at 1:58 PM, Falko wrote:

    > Sorry was typing from the phone - so here is my long answer ;) I played with the compand-type. I noticed that sometimes the voice quality was very bad and Mark told me to check it out. Sure enough that fixed the quality of the sound/audio. My issue though is the ringback tone when i call the phone, aka rtp not up yet. What's really odd however is that i only had this problem when calling A -> C, but not when calling C -> B. I will try to test it more tomorrow should it happen again. Thanks for the link!
    >
    >
    > INE - The Industry Leader in CCIE Preparation

    > http://www.INE.com

    >

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  • Yes indeed - i was doing WB2 - Lab1

    A - SIP

    B - H323

    C - MGCP

     

    So Sip to MGCP = screwed up ringback according to this theory. Will have to confirm.

  • voice-port 0/4:15

     compand-type u-law

    Seems the PSTN simulator has this configured on some labs - thats why it was not always screwed up. If this is configured, you need to configure this on the corresponding voice-port on SITEC too.

    Just tested this out - without this command - strange sound. With this command - all is fine.

    Thanks all!

  • We try to keep you guessing and not make it too easy to pass the lab! :) Different labs are, well, different!

    Be glad it's not RS where you could have any one of twenty different topologies. At least some things stay somewhat constant in Voice. 



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    On Dec 28, 2012, at 2:33, Falko <[email protected]> wrote:

    voice-port 0/4:15

     compand-type u-law

    Seems the PSTN simulator has this configured on some labs - thats why it was not always this case. If this is configured, you need to configure this on the corresponding voice-port on SITEC too.

    Just tested this out - without this command - strange sound. With this command - all is fine.

    Thanks all!




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  • I like it - as long as i pass the lab, i like about anything at this point ;)

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