No DTMF over PSTN

Hi my home setup is this

 

HQ -2821/T1

SB - 2801/T1

SC - 2811/E1

PSTN - 3725

 

hq/sb sb/hq calls over pstn works fine, dtmf is also ok. But hq/sb to sc calls over pstn has loud noise in it. like a distortion or something, I'm thinking this might be the reason why dtmf is not being sent to sc from hq/sb. Any reason this could be fixed?

Comments

  • This over the PRI connections simulated by the PSTN router?

    When you say noise, are talking perceptible noise when you pick up phones and call from hq phone 1 to site B phone 1?   (I know, silly question, but want to clarify).  If it sounds like a white noise (a hissing sound on the call) you can adjust your input gain down on the side hearing the hiss and increase output attenuation on the pstn.  

    Sent from my iPhone

    On Sep 2, 2013, at 1:55 PM, Lloyd <[email protected]> wrote:

    Hi my home setup is this

     

    HQ -2821/T1

    SB - 2801/T1

    SC - 2811/E1

    PSTN - 3725

     

    hq/sb sb/hq calls over pstn works fine, dtmf is also ok. But hq/sb to sc calls over pstn has loud noise in it. like a distortion or something, I'm thinking this might be the reason why dtmf is not being sent to sc from hq/sb. Any reason this could be fixed?




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  • It's like a hissing sound.

     

    Problem solved, I didn't have to put the gain and attenuation. What happened is SC is using a-law but gw config is in u-law. I just config 'ccm-manager config' get the new xml config from cucm to sc router and it gives me the correct codec, then I turn of 'ccm-manager config' again. Didn't know the no mgcp/mgcp config is not enough to get the cucm gw configuration to sc router [:D]

  • the no mgcp / mgcp resets the association (MGCP Control) of the gateway.  Without the ccm-manager config statement, you need to manually make config changes on the gateway as well as the CUCM, then reset it on both sides.  It's price we pay for granularity of control over the device.





    On Tue, Sep 3, 2013 at 12:22 AM, Lloyd <[email protected]> wrote:

    It's like a hissing sound.

     

    Problem solved, I didn't have to put the gain and attenuation. What happened is SC is using a-law but gw config is in u-law. I just config 'ccm-manager config' get the new xml config from cucm to sc router and it gives me the correct codec, then I turn of 'ccm-manager config' again. Didn't know the no mgcp/mgcp config is not enough to get the cucm gw configuration to sc router Big Smile




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  • YEAH lessons learned from me there. So its either we put the we issue 'ccm-manager-config' then remore again, or manually add the changes we did in the mgcp gw.

    Another problem came up after I get the config from cucm to router-gw. PSTN phone now has the hissing static sound. What I did was to make the e1 port in pstn use u-law as well, since the pstn's e1 interface facing the interface of sc's e1 is in u-law now.

     

    And I though those hissing sounds are normal if calls came from T1 to E1 viceversa until I invoked dtmf for voicemail/srst/bacd.  Hope this will help if anyoneis facing the same issue as I did [;)]

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