diff -urN gnokii-0.6.14.orig/common/phones/atgen.c gnokii-0.6.14/common/phones/atgen.c
--- gnokii-0.6.14.orig/common/phones/atgen.c	2006-08-28 00:36:54.000000000 +0200
+++ gnokii-0.6.14/common/phones/atgen.c	2007-01-04 14:31:37.723831751 +0100
@@ -29,6 +29,7 @@
   Copyright (C) 2002-2004 BORBELY Zoltan
   Copyright (C) 2003-2004 Igor Popik
   Copyright (C) 2004      Hugo Hass, Ron Yorston
+  Copyright (C) 2007      Jeremy Laine
 
   This file provides functions specific to generic AT command compatible
   phones. See README for more details on supported mobile phones.
@@ -102,6 +103,7 @@
 static gn_error AT_AnswerCall(gn_data *data, struct gn_statemachine *state);
 static gn_error AT_CancelCall(gn_data *data, struct gn_statemachine *state);
 static gn_error AT_SetCallNotification(gn_data *data, struct gn_statemachine *state);
+static gn_error AT_SendDTMF(gn_data *data, struct gn_statemachine *state);
 
 typedef struct {
 	int gop;
@@ -145,6 +147,7 @@
 	{ GN_OP_AT_Ring,               NULL,                     ReplyRing },
 	{ GN_OP_SetCallNotification,   AT_SetCallNotification,   Reply },
 	{ GN_OP_GetNetworkInfo,        AT_GetNetworkInfo,        ReplyGetNetworkInfo },
+	{ GN_OP_SendDTMF,              AT_SendDTMF,              Reply },
 };
 
 char *strip_quotes(char *s)
@@ -1148,6 +1151,20 @@
 	return sm_block_no_retry(GN_OP_GetNetworkInfo, data, state);
 }
 
+static gn_error AT_SendDTMF(gn_data *data, struct gn_statemachine *state)
+{
+	unsigned char req[32];
+
+	if (!data || !data->dtmf_string || strlen(data->dtmf_string) != 1)
+		return GN_ERR_INTERNALERROR;
+
+	snprintf(req, sizeof(req), "AT+VTS=%c\r", data->dtmf_string[0]);
+	if (sm_message_send(strlen(req), GN_OP_SendDTMF, req, state))
+		return GN_ERR_NOTREADY;
+
+	return sm_block_no_retry(GN_OP_SendDTMF, data, state);
+}
+
 static gn_error ReplyReadPhonebook(int messagetype, unsigned char *buffer, int length, gn_data *data, struct gn_statemachine *state)
 {
 	at_driver_instance *drvinst = AT_DRVINST(state);