Index: asterisk-ooh323c/src/chan_h323.c
===================================================================
--- asterisk-ooh323c/src/chan_h323.c	(revision 481)
+++ asterisk-ooh323c/src/chan_h323.c	(working copy)
@@ -465,7 +465,7 @@
                               ast_getformatname_multiple(formats,512,format) );
 
    oldformat = format;
-   format &= ((AST_FORMAT_MAX_AUDIO << 1) - 1);
+   format &= AST_FORMAT_AUDIO_MASK;
    if (!format) {
       ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format "
                           "'%d'\n", format);