5 Transport mechanisms
5.1 Callback interface
The callback interface of the transport module contains several functions. Some of which are mandatory while others are only optional:
- 
        send_message - Send a message. Mandatory 
- 
        block - Block the transport. Optional This function is usefull for flow control. 
- 
        unblock - Unblock the transport. Optional 
For more detail, see the megaco_transport behaviour definition.
5.2 Examples
The Megaco/H.248 application contains implementations for the two protocols specified by the Megaco/H.248 standard; UDP, see megaco_udp, and TCP/TPKT, see megaco_tcp.
