4.1. Using Fast and Slow Start Connections

An application can use one of two methods to establish a connection with an end point, fast start connection and slow start connection. Fast start connection allows the system to setup a call without the use of the H.245 control channel. If the remote side does not support Fast Start, then a slow start connection is established.

Fast start connection is preferable to slow start connection because fewer network round trips are required to set up a call and the local exchange can generate messages when circumstances prevent a connection to the end point.

Note: The connection mode (fast start connection or slow start connection) is specified by setting the value of the PrmForceSlowStart parameter (0=FastStart - default, 1=SlowStart) in the .config file. The FCDGEN utility is used to convert the .config file to a .fcd file that is then used by the downloader when downloading firmware to the board. The connection mode cannot be set dynamically at run time.

When using Global Call with a DM3 board that uses an embedded stack, the scenarios for fast start connection and slow start connection are the same.

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