ISDN_USAGE_MODEM  221 include/linux/isdn.h #define USG_MODEM(x)        ((x & ISDN_USAGE_MASK)==ISDN_USAGE_MODEM)
ISDN_USAGE_MODEM  226 include/linux/isdn.h #define USG_MODEMORVOICE(x) (((x & ISDN_USAGE_MASK)==ISDN_USAGE_MODEM) || \