diff --git a/examples/conversations/run.py b/examples/conversations/run.py
index 1d11875..64b47aa 100644
--- a/examples/conversations/run.py
+++ b/examples/conversations/run.py
@@ -72,7 +72,7 @@
     participant_id="agent_123",
     attachments=[
         Attachment(
-            type=AttachmentType.FILE,
+            type=AttachmentType.DOCUMENT,
             file_name="bank_statement.pdf",
         )
     ],
diff --git a/src/gradient_labs/conversation.py b/src/gradient_labs/conversation.py
index b6b852b..0f809d9 100644
--- a/src/gradient_labs/conversation.py
+++ b/src/gradient_labs/conversation.py
@@ -23,6 +23,7 @@ class ConversationChannel(str, Enum):
 
     EMAIL: str = "email"
     LIVE_CHAT: str = "web"
+    VOICE: str = "voice"
 
 
 class AttachmentType(str, Enum):
@@ -30,7 +31,8 @@ class AttachmentType(str, Enum):
     that a customer has uploaded into the conversation."""
 
     IMAGE: str = "image"
-    FILE: str = "file"
+    DOCUMENT: str = "document"
+    AUDIO: str = "audio"
 
 
 class ConversationEventType(str, Enum):
@@ -39,14 +41,6 @@ class ConversationEventType(str, Enum):
     # INTERNAL_NOTE means that an internal note has been added to the conversation.
     INTERNAL_NOTE: str = "internal-note"
 
-    # JOIN means the customer or human agent joined the
-    # conversation.
-    JOIN: str = "join"
-
-    # LEAVE means the customer or human agent left the
-    # conversation.
-    LEAVE: str = "leave"
-
     # DELIVERED means that a message has been delivered
     # to a participant
     DELIVERED: str = "delivered"