DTMF SETTING FOR 3CX

Discussion in '3CX Phone System - General' started by tranceaddict, Apr 7, 2009.

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  1. tranceaddict

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    I have several DTMF options in my phone setup?

    What are the correct settings for 3CX. The options are:

    RFC2833
    Inband DTMF
    Send DTMF SIP info
     
  2. 5qg4

    5qg4 Active Member

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    RFC2833
     
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  3. aabbcc

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    RFC2833
    Inband DTMF
    Send DTMF SIP info

    Anyone knows what the difference is? Can I select all of them?
     
  4. leejor

    leejor Well-Known Member

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    Have a look at this site for a detailed explanation....http://www.faqs.org/rfcs/rfc2833.html

    in a nutshell...You can send the DTMF "In-Band" as audio from one end to the other or the SIP device can decode the tones and then send SIP packets to the far end where the tones are regenerated. In-band has a lot of trouble and in fact may not work at all when you choose to use the low bit rate encoders.
     
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