asterisk 1.6 crash at incoming isdn call on 64 bit system

Binary package hint: libcapi20-3

Release: 9.10
Compiler: gcc 4.4.1 (Ubuntu 4.4.1-4ubuntu9)
libcapi20-3:
  Installiert: 1:3.12.20071127-0ubuntu6
  Kandidat: 1:3.12.20071127-0ubuntu6

Asterisk crashes due to problem in libcapi20-3

crash in capi20.c
    => unsigned capi20_put_message (unsigned ApplID, unsigned char *Msg) ...
    => ... memcpy(sndbuf+len, dataptr, datalen);
reason:
     dataptr is currupt

resolution:
   file: capiutils.h
      modify
          #define CAPIMSG_U64(m, off) (((_cqword)CAPIMSG_U32(m, off)) |(((_cqword)CAPIMSG_U32(m, off+4))<<32))
      to
          #define CAPIMSG_U64(m, off) ((((_cqword)CAPIMSG_U32(m, off)) & 0xffffffff) |(((_cqword)CAPIMSG_U32(m, off+4))<<32))

I am not sure why, but the compiler seems to handle signed values instead of unsigned values as expected. It fills up the upper half of the result value (unsigned long long) with 0xff if the highest bit of the lower long value is set. This results in an invalid address. The and operation (& 0xffffffff) prevents these unwanted invalid bits.