added warm transfer props

Author: ramsrib

fern/calls/assistant-based-warm-transfer.mdx

@@ -53,6 +53,7 @@ The `function.name` property identifies your transfer tool. Use this name when i
         "transferAssistant": {
           "firstMessage": "Hello, I have a customer on the line. Are you available to take this call?",
           "maxDurationSeconds": 120,
+          "silenceTimeoutSeconds": 30,
           "model": {
             "provider": "openai",
             "model": "gpt-4o",
@@ -91,6 +92,10 @@ The `function.name` property identifies your transfer tool. Use this name when i
   Maximum duration in seconds for the operator call. The transfer is automatically cancelled if this limit is reached.
 </ParamField>
 
+<ParamField path="transferAssistant.silenceTimeoutSeconds" type="number" default={30}>
+  Number of seconds to wait during silence before automatically cancelling the transfer. Must be between 10 and 3600 seconds.
+</ParamField>
+
 <ParamField path="transferAssistant.model" type="object" required>
   Assistant configuration including provider, model, and system messages that control the transfer assistant's behavior
 </ParamField>