RTFM!
you did not provide an URL to the project you are having problems with,
but I think it is this one:
http://www.asterisk.org/index.php?menu=download
As described there, the anoncvs password is "anoncvs".
As I quote from you Post:
Quote:
.... cvs checkout: used empty password; try "cvs login" with a real password"
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You tried to authenticate with an empty password.
Please use the password givven in the installation documentation, it should work then.