diff --git a/sinch/domains/voice/models/svaml/actions/actions.py b/sinch/domains/voice/models/svaml/actions/actions.py
index eaccadb7..8ab1a500 100644
--- a/sinch/domains/voice/models/svaml/actions/actions.py
+++ b/sinch/domains/voice/models/svaml/actions/actions.py
@@ -144,6 +144,9 @@ def as_dict(self):
         if payload.get("suppress_callbacks"):
             payload["suppressCallbacks"] = payload.pop("suppress_callbacks")
 
+        if payload.get("call_headers"):
+            payload["callHeaders"] = payload.pop("call_headers")
+
         return payload