FS-11824 [core] add NOT_ACCEPTABLE string to cause mapping

src/switch_channel.c

@@ -128,6 +128,7 @@ static struct switch_cause_table CAUSE_CHART[] = {
 	{"BUSY_EVERYWHERE", SWITCH_CAUSE_BUSY_EVERYWHERE},
 	{"DECLINE", SWITCH_CAUSE_DECLINE},
 	{"DOES_NOT_EXIST_ANYWHERE", SWITCH_CAUSE_DOES_NOT_EXIST_ANYWHERE},
+	{"NOT_ACCEPTABLE", SWITCH_CAUSE_NOT_ACCEPTABLE},
 	{"UNWANTED", SWITCH_CAUSE_UNWANTED},
 	{NULL, 0}
 };