40.3 Configuring DTMF Tones for Test Calls
By default, the DTMF signal that is played to answered incoming and outgoing test calls is
"3212333". You can change this using the ini file parameter, TestCallDtmfString. The
DTMF signaling type (e.g., out-of-band or in-band) can be configured using the 'DTMF
Transport Type' parameter. For more information, see 'Dual-Tone Multi-Frequency
Signaling' on page 156.
Note: To generate DTMF tones, the device's DSP resources are required.