The Maxwell's supports the following DTMF options.

    • Automatic negotiation of DTMF transmission YES/NO
    • Audio
    • RFC4733
    • Audio + RFC4733
    • SIP INFO
    • RFC 4733 + SIP Info
    • Audio + RFC4733 + SIP Info

Web-interface

In the web-interface go to: SETTINGS - Telephony - Connections - DTMF transmission


Provisioning parameterValue

SIP.Account.x.DTMFTransmission
Maxwell B/2/3: x = 0 - 3
Maxwell 4: x = 0 - 5

0 = Audio
1 = RFC 4733
2 = Audio + RFC 4733
3 = SIP info
4 = RFC 4733 + SIP info
5 = Audio + RFC 4733 + SIP info 
IP.Account.x.AutoNegOfDTMFTransmission
Maxwell B/2/3: x = 0 - 3
Maxwell 4: x = 0 - 5		0 = Automatic DTMF transmission disabled
1 = Automatic DTMF transmission enabled

Example:

<param name="SIP.Account.0.DTMFTransmission" value="1"/>