Parsing errors on CSTA II asn file

Hello

If I run this command using SNACC v1.6 on Windows

esnacc -C CSTAp2.asn
CSTAp2.asn(187) : parse error at symbol "CSTA-alternate-call"

Parsing errors---cannot proceed


The file CSTAp2.asn can be downloaded from here:

http://www.iteloffice.com/download/CSTAp2.asn

This is a standard asn.1 file so why does it not work?  What do I need to do
to file for it to compile?

Angus