diff --git a/config.ini b/config.ini
deleted file mode 100644
index 1dd87b4..0000000
--- a/config.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-target_extensions = 334, 338
-list_filter_type = whitelist
-extension_filter_list = 404, 911
-blacklisted_terms = vesibule, inpatient
diff --git a/config.json b/config.json
new file mode 100644
index 0000000..1c388e8
--- /dev/null
+++ b/config.json
@@ -0,0 +1,46 @@
+{
+  "target_extensions": ["334", "338", "227", "228"],
+  "list_filter_type": "blacklist",
+  "extension_filter_list": [
+    "209",
+    "214",
+    "220",
+    "234",
+    "254",
+    "333",
+    "344",
+    "348",
+    "355",
+    "365",
+    "370",
+    "371",
+    "372",
+    "373",
+    "374",
+    "375",
+    "377",
+    "378",
+    "379",
+    "383",
+    "384",
+    "390",
+    "391",
+    "393",
+    "397",
+    "398",
+    "529"
+  ],
+  "blacklisted_terms": ["vesibule", "inpatient"],
+
+  "prepend_extensions": [
+    {"name": "Night Hours", "extension": "*271"},
+    {"name": "Overhead Page", "extension": "900"},
+    {"name": "All page", "extension": "300"},
+    {"name": "Park 71", "extension": "71"},
+    {"name": "Park 72", "extension": "72"},
+    {"name": "OR", "extension": "356"},
+    {"name": "Lab", "extension": "340"},
+    {"name": "Business", "extension": "249"},
+    {"name": "OP Nurse", "extension": "336"}
+  ]
+}
diff --git a/gen_pc_sidecar.php b/gen_pc_sidecar.php
index 70f7a8b..24720e7 100755
--- a/gen_pc_sidecar.php
+++ b/gen_pc_sidecar.php
@@ -1,16 +1,22 @@
 #!/usr/bin/php -q
 <?php
 
-$TARGET_EXTENSIONS = read_config_ini("target_extensions");
-$LIST_FILTER_TYPE = read_config_ini("list_filter_type")[0];
-$EXTENSION_FILTER_LIST = read_config_ini("extension_filter_list");
-$BLACKLISTED_TERMS = read_config_ini("blacklisted_terms");
-
 $PROVISION_DIR = '/tftpboot';
 
 $bootstrap_settings['freepbx_auth'] = false;
 require_once('/etc/freepbx.conf');
 
+$DB = FreePBX::Database();
+
+$CONFIG_PATH = "./config.json";
+$CONFIG = read_config_json_file($CONFIG_PATH);
+
+$TARGET_EXTENSIONS = read_config_json("target_extensions");
+$LIST_FILTER_TYPE = read_config_json_string("list_filter_type");
+$EXTENSION_FILTER_LIST = read_config_json("extension_filter_list");
+$BLACKLISTED_TERMS = read_config_json("blacklisted_terms");
+$PREPEND_EXTENSIONS = read_config_json("prepend_extensions");
+
 function main(): void {
   global $TARGET_EXTENSIONS;
   global $PROVISION_DIR;
@@ -45,13 +51,12 @@ function main(): void {
   }
 }
 
-
 function pull_db(): array {
-  $db = FreePBX::Database();
+  global $DB;
   $pbdb = [];
 
   try {
-      $stmt = $db->prepare("
+      $stmt = $DB->prepare("
           SELECT name, extension
           FROM users
           WHERE extension REGEXP '^[0-9]+$'
@@ -142,23 +147,16 @@ function blacklist_extension_filter(&$pbdb) {
 }
 
 function prepend_contact_list(&$pbdb) {
-  $pbdb_prepend = [
-    [ 'name' => 'Night Hours', 'extension' => '*271', ],
-    [ 'name' => 'Overhead Page', 'extension' => '900', ],
-    [ 'name' => 'All page', 'extension' => '300'],
-    [ 'name' => 'Park 71', 'extension' => '71'],
-    [ 'name' => 'Park 72', 'extension' => '72'],
-  ];
-
-  array_unshift($pbdb, ...$pbdb_prepend);
+  global $PREPEND_EXTENSIONS;
+  array_unshift($pbdb, ...$PREPEND_EXTENSIONS);
 }
 
 function pull_mac_list(): array {
-  $db = FreePBX::Database();
+  global $DB;
   $mac_db = [];
 
   try {
-      $stmt = $db->prepare("
+      $stmt = $DB->prepare("
           SELECT mac, SUBSTRING_INDEX(ext, '-', 1) AS ext
           FROM endpoint_extensions
           ORDER BY CAST(ext AS UNSIGNED)
@@ -171,20 +169,54 @@ function pull_mac_list(): array {
   return array_column($mac_db, 'mac', 'ext');
 }
 
-function read_config_ini($CONFIG_KEY): array {
-  $config = parse_ini_file('config.ini');
-  $config_value = preg_split('/\s*,\s*/', $config[$CONFIG_KEY] ?? '', -1, PREG_SPLIT_NO_EMPTY);
 
-  $config_value = array_map(
-      fn($v) => strtolower(trim((string)$v)),
-      $config_value
-  );
+function read_config_json_file(string $path): array {
+    global $COFNIG_PATH;
+    if (!is_file($path)) {
+        throw new RuntimeException("Config file not found: {$path}");
+    }
 
-  $config_value = array_values(array_filter($config_value, fn($v) => $v !== ''));
+    $raw = file_get_contents($path);
+    if ($raw === false) {
+        throw new RuntimeException("Unable to read config file: {$path}");
+    }
 
-  return $config_value;
+    $data = json_decode($raw, true);
+    if (!is_array($data)) {
+        throw new RuntimeException("Invalid JSON in config file: {$path}");
+    }
+
+    return $data;
 }
 
+function read_config_json($key) {
+    global $CONFIG;
+    $value = $CONFIG[$key] ?? [];
+
+    if (is_string($value)) {
+        $items = preg_split('/\s*,\s*/', $value, -1, PREG_SPLIT_NO_EMPTY);
+    } elseif (is_array($value)) {
+        $items = $value;
+    } else {
+        $items = [];
+    }
+
+    $items = array_map(
+        fn($v) => strtolower(trim((string)$v)),
+        $items
+    );
+
+    $items = array_values(array_filter($items, fn($v) => $v !== ''));
+
+    return $items;
+}
+
+function read_config_json_string(array $config, string $key): string {
+    $value = $config[$key] ?? '';
+    return strtolower(trim((string)$value));
+}
+
+
 function pull_xml_file($file): DOMDocument {
   if (!file_exists($file)) {
     $file = '/tftpboot/000000000000-features.cfg';