Yes, we are aware of that command. We have been able to enable and disable the various tones.
But, my understanding of the command is that it tells the MA5616 to use a particular tone (say A43), if it doesn't receive a tone from the VTU-R
We have a VTU-R device where we believe the V43 tones have been disabled and we wish to verify this is the case. But when we enable only the V43 tones (using the command you suggested) on the MA5616, we still get sync. Suggesting:
1. The V43 tones are not disabled on our VTU-R OR
2. The MA5616 only will use V43, if it receives no other tones from the VTU-R
That is why we would like a way to see exactly what tones are being used during handshaking
Disabling of V43 tones is a requirement of a number of carriers like British Telecom and Australia's NBN.
Thanks
Mark.