## Description of the struct isdn_if

    typedef struct {
      int channels;
      int maxbufsize;
      unsigned long features;
      unsigned short hl_hdrlen;
      void (*rcvcallb)(int, int, u_char*, int);
      void (*rcvcallb_skb)(int, int, struct sk_buff *);
      int (*statcallb)(isdn_ctrl*);
      int (*command)(isdn_ctrl*);
      int (*writebuf)(int, int, u_char*, int, int);
      int (*writebuf_skb)(int, int, struct sk_buff *);
      int (*writecmd)(u_char*, int, int, int, int);
      int (*readstat)(u_char*, int, int, int, int);
      char id[20];
    } isdn_if;

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