Revert "simplify code to get phone number for incoming calls"

This reverts commit b0bb9ac9fc.

This fixes the issue with modemlog having filled with extra mmcli
output

scripts/modem/sxmo_modemmonitor.sh

@@ -22,7 +22,9 @@ modem_n() {
 lookupnumberfromcallid() {
 	VOICECALLID=$1
 	mmcli -m "$(modem_n)" --voice-list-calls -o "$VOICECALLID" -K |
-		sed -E 's/^call\.properties\.number\s+:\s+//'
+		grep call.properties.number |
+		cut -d ':' -f 2 |
+		tr -d ' '
 }
 
 checkformissedcalls() {