Say_alpha in phpAGI

Hi all,
In Folder agi-bin, I created read.php.
#!/usr/bin/php -q

<?php include("phpagi.php"); $agi = new AGI(); $agi->answer(); $agi-> Say_Digits(12); --> OK $agi ->Say_Alpha (12); --> Not execute ?>

The command agi->Say_alpha(12) do not execute .I have already turned on debug mode.
I do not know the reason. Please help me. Thank you.

There is nothing here that needs AGI. Also, this is a discussion forum, not a support one.