Agents on phone calls can take three actions: EndConversation: allows the agent to end the call, e.g. if the user says “Goodbye!” 
vocode_client.actions.create_action(
  request=CreateActionRequest(
      type=ActionType.ACTION_END_CONVERSATION
  )
)
DTMF: allows the agent to hit dial tones during a call, e.g. navigating a phone tree 
vocode_client.actions.create_action(
  request=CreateActionRequest(
      type=ActionType.ACTION_DTMF
  )
)
TransferCall: allows the agent to transfer the call to another phone number 
vocode_client.actions.create_action(
  request=CreateActionRequest(
      type=ActionType.ACTION_TRANSFER_CALL,
      config=TransferCallActionUpdateParamsConfig(
          phone_number="11234567890"
      )
  )
)
You can attach these as IDs to your phone number agent as follows: 
vocode_client.numbers.update_number(
  phone_number="11234567890",
  inbound_agent=UpdateNumberRequestInboundAgent(
      actions=["<ACTION UUID>"]
  )
)
You can also add these as actions as raw payloads as follows: 
vocode_client.numbers.update_number(
  phone_number="11234567890",
  inbound_agent=UpdateNumberRequestInboundAgent(
      actions=[TransferCallActionUpdateParams(
          type=ActionType.ACTION_TRANSFER_CALL,
          config=TransferCallActionUpdateParamsConfig(
              phone_number="11234567890"
          )
      )]
  )
)