unsigned int ss5; /* set, if SS5 signalling enabled, also holds feature bits */
int channel_force; /* forces channel by protocol */
int nodtmf; /* disables DTMF */
+ int dtmf_threshold; /* DTMF level threshold */
struct select_channel *out_channel; /* list of channels to select */
struct select_channel *in_channel; /* the same for incoming channels */
int block; /* set if interface is blocked */