Q921SetLogCB     2763 src/ftmod/ftmod_isdn/ftmod_isdn.c 	Q921SetLogCB(&isdn_data->q921, &ftdm_isdn_q921_log, span);
Q921SetLogCB      216 src/isdn/include/Q921.h void Q921SetLogCB(L2TRUNK trunk, Q921LogCB_t func, void *priv);