This is caused because the code that prints an error message tries to
snprintf into a 64 character buffer (errorstr) while telling snprintf
it's 128 bytes long (the error messages is actually shorter than 64 but
I think fortify is getting triggered probably by snprintf 0 terminating
the end of the buffer).

Looking at http://www.routemeister.net/projects/sipcalc/download.html
verison 1.1.5 (latest - from 2009!) it looks like it is fixed, so while
I just cooked a simple patch, it seems probably the best thing would be
to update the package to 1.1.5.

Dave

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https://bugs.launchpad.net/bugs/973602

Title:
  sipcalc crashed with SIGABRT in __libc_message()

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