For Mobility Entry users, the station flag DTMF-based feature activation must be enabled when you want to use features during a call (i.e. transfer calls). This function is only applicable on the embeded systems (X1 - X3 -X5 and X8)

A maximum of 16 DTMF code receiver resources are available in the communication system, i.e., a maximum of 16 subscribers (analog, Mobility, etc.) can simultaneously reserve DTMF code receivers. Subscribers for whom the flag is set reserve one code receiver each for the duration of the call.