diff --git a/src/osmo_gsm_tester/resource.py b/src/osmo_gsm_tester/resource.py
index dab3453..f1697ea 100644
--- a/src/osmo_gsm_tester/resource.py
+++ b/src/osmo_gsm_tester/resource.py
@@ -69,6 +69,7 @@
         'modem[].ki': schema.KI,
         'modem[].auth_algo': schema.AUTH_ALGO,
         'modem[].ciphers[]': schema.CIPHER,
+        'modem[].features[]': schema.MODEM_FEATURE,
     }
 
 WANT_SCHEMA = util.dict_add(
diff --git a/src/osmo_gsm_tester/schema.py b/src/osmo_gsm_tester/schema.py
index 9a0906c..6d5f7ad 100644
--- a/src/osmo_gsm_tester/schema.py
+++ b/src/osmo_gsm_tester/schema.py
@@ -81,6 +81,11 @@
         return
     raise ValueError('Unknown Cipher value: %r' % val)
 
+def modem_feature(val):
+    if val in ('sms', 'gprs', 'voicecall', 'ussd'):
+        return
+    raise ValueError('Unknown Modem Feature: %r' % val)
+
 INT = 'int'
 STR = 'str'
 UINT = 'uint'
@@ -94,6 +99,8 @@
 AUTH_ALGO = 'auth_algo'
 TIMES='times'
 CIPHER = 'cipher'
+MODEM_FEATURE = 'modem_feature'
+
 SCHEMA_TYPES = {
         INT: int,
         STR: str,
@@ -108,6 +115,7 @@
         AUTH_ALGO: auth_algo,
         TIMES: times,
         CIPHER: cipher,
+        MODEM_FEATURE: modem_feature,
     }
 
 def validate(config, schema):