IVR does not detect GSM celullar DTMF tones

Discussion in 'General' started by techchip, Mar 3, 2011.

  1. techchip

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    Hello everybody:

    I'm using a FXO port on my A800P card to connect a FWT
    (FWT-8848 GSM) to make gsm cellular phone calls.

    Unfortunately if somebody returns the call to the GSM
    number, the IVR answer the call but it can't detect DTMF
    tones.

    I have already increase RXgain and set DTMFrelax=yes
    with no results.

    Any ideas? how can i trace the dtmf reception to look
    if at least is receiving something?

    Kind Regards,
    Mauricio Florez
     
  2. fmvillares

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    a800p is an openvox card?
     
  3. techchip

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    Yes sir, A800P is openvox card.

    We have 4 PSTN lines on 4 FXO ports that works great with IVR DTMF detection. But the fith line that comes from FWT can't detect DTMF.

    I have already tested the FWT alone and it is sending DTMF tones correctly. (I called the cell phone company's IVR and navigate their menu from the FWT connected directly to an analog phone without no problem).

    I'm using Ulaw if it matters.

    By the way, i'm using dtmfmode=rfc2833 for all our sip extensions, but i don't know if there is any simillar option for incoming trunks.

    Kind Regards,

    Mauricio F.
     
  4. fmvillares

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