Ringing sound configurable

Signed-off-by: Miles Alan <m@milesalan.com>

scripts/modem/sxmo_modemmonitor.sh

@@ -20,6 +20,12 @@ modem_n() {
 	echo "$MODEMS" | grep -oE 'Modem\/([0-9]+)' | cut -d'/' -f2
 }
 
+ring() {
+	action="sxmo_vibratepine 2000 & sxmo_setpineled green 1"
+	[[ -x "$XDG_CONFIG_HOME/sxmo/ringing" ]] && action="$XDG_CONFIG_HOME/sxmo/ringing"
+	${action}
+}
+
 checkforincomingcalls() {
 	VOICECALLID="$(
 		mmcli -m "$(modem_n)" --voice-list-calls -a |
@@ -32,7 +38,7 @@ checkforincomingcalls() {
 		 return
 	fi
 
-	sxmo_vibratepine 2000 & sxmo_setpineled green 1
+	ring
 
 	# Delete all previous calls which have been terminated calls
 	for CALLID in $(