[asterisk-users] AGI/PHP: missing arguments

hi folks,

I've built a simple PHP-script utilizing the AGI-interface. in extensions.conf I trigger the script and pass a single value as first argument:

exten => h,1,DeadAGI(process.php|${Enter})

On the Asterisk-console, I can actually see that the script is called correctly (something like "DeadAGI(process.php|1234)"). However, when I read stdin in the PHP script, I receive all AGI-environment variables (agi_request, agi_callerid etc.) correctly, but I'm missing the actual passed value (which should be in agi_arg_1 etc.). the last thing I get from stdin is the environment-variable agi_accountcode, after this it seems to stop.

what's really strange is, that the exact same script has been working correctly on a different machine...

any suggestions highly appreciated, thx!

regards,
michael