5.10.1. Feature Description 
The DTMF dialing is an optional feature that allows the DTMF signaling
in through-connect states.
This case includes anate, analog VoiceMail system, analog IVR, special
devices (e.g. dictation) etc. The device can either be configured to
have DTMF dialing capability or to allow DTMF signaling from its partner
while through-connected (allow to have DTMF suffix dialing in the line
), via the DHPAR=DTMFST.
The following situations are not covered before:
- Digital device in through-connect state with another digital device.
- Through-connect states in a conference.
The DTMF dialing enhancements cover the situations above on an administrable basis.
In the
conference, if at least one member (except that one which is sending digits) requires
DTMF
signaling, this will be enough to generate DTMF signaling for all conference members.
In
addition there is a possibility to spare a local station member to hear the DTMF tones.
Only
conferences up to 4 local conference members will be allowed to receive DTMF signaling.