void bchannel_receive(struct mISDNhead *hh, unsigned char *data, int len);
void bchannel_send(unsigned int prim, unsigned int id, unsigned char *data, int len);
void bchannel_receive(struct mISDNhead *hh, unsigned char *data, int len);
void bchannel_send(unsigned int prim, unsigned int id, unsigned char *data, int len);