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# View Source Transport mechanisms

## 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.

## 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`.

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