diff --git a/lib/routes/api/accounts.js b/lib/routes/api/accounts.js
index 89313d3a..64062f77 100644
--- a/lib/routes/api/accounts.js
+++ b/lib/routes/api/accounts.js
@@ -224,7 +224,8 @@ function validateUpdateCall(opts) {
     'conf_mute_status',
     'mute_status',
     'sip_request',
-    'record'
+    'record',
+    'inband_dtmf',
   ]
     .reduce((acc, prop) => (opts[prop] ? ++acc : acc), 0);
 
@@ -266,6 +267,9 @@ function validateUpdateCall(opts) {
   if (opts.record && !opts.record.action) {
     throw new DbErrorBadRequest('record requires action property');
   }
+  if (opts.inband_dtmf && !['digit'].includes(opts.inband_dtmf)) {
+    throw new DbErrorBadRequest('invalid inband_dtmf');
+  }
   if ('startCallRecording' === opts.record?.action && !opts.record.siprecServerURL) {
     throw new DbErrorBadRequest('record requires siprecServerURL property when starting recording');
   }