diff -urN asterisk.orig/main/channel.c asterisk/main/channel.c
--- asterisk.orig/main/channel.c	2008-02-02 14:44:04.000000000 -0800
+++ asterisk/main/channel.c	2008-02-02 14:44:29.000000000 -0800
@@ -2437,6 +2437,8 @@
 					f->subclass = chan->emulate_dtmf_digit;
 					f->len = ast_tvdiff_ms(now, chan->dtmf_tv);
 					chan->dtmf_tv = now;
+					ast_clear_flag(chan, AST_FLAG_EMULATE_DTMF);
+					chan->emulate_dtmf_digit = 0;
 					if (chan->audiohooks) {
 						struct ast_frame *old_frame = f;
 						f = ast_audiohook_write_list(chan, chan->audiohooks, AST_AUDIOHOOK_DIRECTION_READ, f);