diff -urN asterisk-1.4.17.orig/main/channel.c asterisk-1.4.17/main/channel.c
--- asterisk-1.4.17.orig/main/channel.c	2007-12-27 14:40:02.000000000 -0700
+++ asterisk-1.4.17/main/channel.c	2008-02-03 20:19:38.000000000 -0700
@@ -2496,6 +2496,8 @@
 					f = &chan->dtmff;
 					f->frametype = AST_FRAME_DTMF_END;
 					f->subclass = chan->emulate_dtmf_digit;
+					ast_clear_flag(chan, AST_FLAG_EMULATE_DTMF);
+					chan->emulate_dtmf_digit = 0;
 					f->len = ast_tvdiff_ms(now, chan->dtmf_tv);
 					chan->dtmf_tv = now;
 					ast_log(LOG_DTMF, "DTMF end emulation of '%c' queued on %s\n", f->subclass, chan->name);