Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 191953)
+++ channels/chan_sip.c	(working copy)
@@ -4403,9 +4403,11 @@
 		f = &ast_null_frame;
 	}
 	/* Don't forward RFC2833 if we're not supposed to */
-	if (f && (f->frametype == AST_FRAME_DTMF) &&
-	    (ast_test_flag(&p->flags[0], SIP_DTMF) != SIP_DTMF_RFC2833))
+	if (f && (f->frametype == AST_FRAME_DTMF_BEGIN || f->frametype == AST_FRAME_DTMF_END) &&
+	    (ast_test_flag(&p->flags[0], SIP_DTMF) != SIP_DTMF_RFC2833)) {
+		ast_log(LOG_DEBUG,"Ignoring DTMF (%c) RTP frame because dtmfmode is not RFC2833\n", f->subclass);
 		return &ast_null_frame;
+	}
 
 		/* We already hold the channel lock */
 	if (!p->owner || (f && f->frametype != AST_FRAME_VOICE))