Enabling call waiting fixes incoming calls on the Openmoko Freerunner

src/gsm.c

@@ -375,6 +375,14 @@ int gsm_set_call_presentation(GSM * gsm, int set)
 }
 
 
+/* gsm_set_call_waiting */
+int gsm_set_call_waiting(GSM * gsm, int unsollicited, int mode)
+{
+	return gsm_modem_set_call_waiting(gsm->modem, (unsollicited != 0) ? TRUE
+			: FALSE, (mode != 0) ? TRUE : FALSE);
+}
+
+
 /* gsm_set_extended_errors */
 int gsm_set_extended_errors(GSM * gsm, int extended)
 {

src/gsm.h

@@ -316,6 +316,7 @@ void gsm_set_callback(GSM * gsm, GSMCallback callback, gpointer data);
 
 unsigned int gsm_get_retry(GSM * gsm);
 int gsm_set_call_presentation(GSM * gsm, int set);
+int gsm_set_call_waiting(GSM * gsm, int unsollicited, int mode);
 int gsm_set_extended_ring_reports(GSM * gsm, int extended);
 int gsm_set_functional(GSM * gsm, int functional);
 int gsm_set_line_presentation(GSM * gsm, int set);

src/modem.c

@@ -563,6 +563,18 @@ int gsm_modem_set_call_presentation(GSMModem * gsmm, gboolean set)
 }
 
 
+/* gsm_modem_set_call_waiting */
+int gsm_modem_set_call_waiting(GSMModem * gsmm, gboolean unsollicited,
+		gboolean mode)
+{
+	char cmd[] = "AT+CCWA=X,X";
+
+	cmd[8] = unsollicited ? '1' : '0';
+	cmd[10] = mode ? '1' : '0';
+	return (gsm_queue(gsmm->gsm, cmd) != NULL) ? 0 : 1;
+}
+
+
 /* gsm_modem_set_echo */
 int gsm_modem_set_echo(GSMModem * gsmm, gboolean echo)
 {

src/modem.h

@@ -75,6 +75,8 @@ int gsm_modem_send_message(GSMModem * gsmm, char const * number,
 		char const * text);
 
 int gsm_modem_set_call_presentation(GSMModem * gsmm, gboolean set);
+int gsm_modem_set_call_waiting(GSMModem * gsmm, gboolean unsollicited,
+		gboolean mode);
 int gsm_modem_set_echo(GSMModem * gsmm, gboolean echo);
 int gsm_modem_set_extended_errors(GSMModem * gsmm, gboolean extended);
 int gsm_modem_set_extended_ring_reports(GSMModem * gsmm, gboolean extended);

src/phone.c

@@ -2179,6 +2179,7 @@ static int _phone_gsm_event(GSMEvent * event, gpointer data)
 				return 0;
 			}
 			gsm_set_call_presentation(phone->gsm, TRUE);
+			gsm_set_call_waiting(phone->gsm, TRUE, TRUE);
 			gsm_set_extended_ring_reports(phone->gsm, TRUE);
 			gsm_set_operator_mode(phone->gsm,
 					GSM_OPERATOR_MODE_AUTOMATIC);