diff --git a/client/src/pages/Alerts.jsx b/client/src/pages/Alerts.jsx
index d8654b8..7bb191c 100644
--- a/client/src/pages/Alerts.jsx
+++ b/client/src/pages/Alerts.jsx
@@ -462,7 +462,9 @@ const CreateAlertRuleModal = ({ onClose, onSave }) => {
     device_ids: [],
     drone_types: [],
     min_rssi: '',
-    max_rssi: ''
+    max_rssi: '',
+    sms_phone_number: '',
+    webhook_url: ''
   });
   const [saving, setSaving] = useState(false);
   const [devices, setDevices] = useState([]);
@@ -502,6 +504,11 @@ const CreateAlertRuleModal = ({ onClose, onSave }) => {
       if (!payload.max_rssi) delete payload.max_rssi;
       if (!payload.device_ids || payload.device_ids.length === 0) payload.device_ids = null;
       if (!payload.drone_types || payload.drone_types.length === 0) payload.drone_types = null;
+      
+      // Only include webhook_url if webhook channel is selected
+      if (!payload.alert_channels || !payload.alert_channels.includes('webhook')) {
+        delete payload.webhook_url;
+      }
 
       await api.post('/alerts/rules', payload);
       onSave();
@@ -733,6 +740,46 @@ const CreateAlertRuleModal = ({ onClose, onSave }) => {
                     )}
                   </div>
                 </div>
+
+                {/* Conditional channel-specific fields */}
+                {formData.alert_channels.includes('sms') && (
+                  <div>
+                    <label className="block text-sm font-medium text-gray-700 mb-1">
+                      SMS Phone Number
+                    </label>
+                    <input
+                      type="tel"
+                      name="sms_phone_number"
+                      placeholder="+1234567890"
+                      className="w-full border border-gray-300 rounded-md px-3 py-2 focus:ring-primary-500 focus:border-primary-500"
+                      value={formData.sms_phone_number || ''}
+                      onChange={handleChange}
+                    />
+                    <div className="text-xs text-gray-500 mt-1">
+                      Include country code (e.g., +1 for US)
+                    </div>
+                  </div>
+                )}
+
+                {formData.alert_channels.includes('webhook') && (
+                  <div>
+                    <label className="block text-sm font-medium text-gray-700 mb-1">
+                      Webhook URL *
+                    </label>
+                    <input
+                      type="url"
+                      name="webhook_url"
+                      placeholder="https://your-webhook-endpoint.com/alerts"
+                      required={formData.alert_channels.includes('webhook')}
+                      className="w-full border border-gray-300 rounded-md px-3 py-2 focus:ring-primary-500 focus:border-primary-500"
+                      value={formData.webhook_url || ''}
+                      onChange={handleChange}
+                    />
+                    <div className="text-xs text-gray-500 mt-1">
+                      Must be a valid HTTPS URL
+                    </div>
+                  </div>
+                )}
               </div>
             </div>
 
diff --git a/server/routes/alert.js b/server/routes/alert.js
index 12e27a9..be5395a 100644
--- a/server/routes/alert.js
+++ b/server/routes/alert.js
@@ -18,7 +18,7 @@ const alertRuleSchema = Joi.object({
   min_detections: Joi.number().integer().min(1).default(1),
   cooldown_period: Joi.number().integer().min(0).default(600),
   alert_channels: Joi.array().items(Joi.string().valid('sms', 'email', 'webhook')).default(['sms']),
-  webhook_url: Joi.string().uri().optional(),
+  webhook_url: Joi.string().uri().allow('').optional(),
   active_hours: Joi.object({
     start: Joi.string().pattern(/^\d{2}:\d{2}$/).optional(),
     end: Joi.string().pattern(/^\d{2}:\d{2}$/).optional()
@@ -66,6 +66,21 @@ router.get('/rules', authenticateToken, async (req, res) => {
 // POST /api/alerts/rules - Create new alert rule
 router.post('/rules', authenticateToken, validateRequest(alertRuleSchema), async (req, res) => {
   try {
+    // Custom validation for webhook URL when webhook channel is selected
+    if (req.body.alert_channels && req.body.alert_channels.includes('webhook')) {
+      if (!req.body.webhook_url || req.body.webhook_url.trim() === '') {
+        return res.status(400).json({
+          success: false,
+          message: 'Validation error',
+          errors: [{
+            field: 'webhook_url',
+            message: 'Webhook URL is required when webhook channel is selected',
+            value: req.body.webhook_url || ''
+          }]
+        });
+      }
+    }
+
     const alertRule = await AlertRule.create({
       ...req.body,
       user_id: req.user.id