S-COM 6K Owner's Manual page 56

K. Defaults
Until changed by the codes mentioned, the DTMF tone duration is 100 ms, and the gap
between DTMF characters is 100 ms.
L. Other Notes
The DTMF decoder is turned off during DTMF pages to prevent the page from being acted
on by the controller.
Since the DTMF encoder is shared between the DTMF paging function and the DTMF
autopatch dialing function, there may be a delay in paying while a number is dialed (or vice
versa).
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6K V1.02 03-16-91