Polycom VS4000 To configure crypto resync, Go to System Info Admin Setup Security Crypto Resync

Chapter 3 - Configuring Network Use

To configure crypto resync:

1.Go to System Info > Admin Setup > Security > Crypto Resync.

2.Configure these settings:

Setting	Description
Crypto Resync	Allows a system connected to cryptographic equipment to
	signal when it loses video synchronization during a call.
	The cryptographic equipment can then resynchronize
	with the far end.
	When this option is enabled, the resynchronization pulses
	are sent out on the RTS signal.
	To use this option, the cable to your cryptographic
	equipment should route the V.35/RS-449/RS-530 network
	interface module’s RTS signal to the appropriate resync
	input on the cryptographic equipment. The equipment’s
	RTS input can be connected to the V.35/RS-449/RS-530
	network interface module’s DTR output or tied high.
Time Between Pulses (sec)	Specifies the time between resync pulses in seconds.
Pulse Width (millisec)	Specifies the pulse duration in milliseconds.

You may need to use crypto resync when you connect a cryptographic coder/decoder between the system and the network. This allows the system to signal the cryptographic device when video synchronization is interrupted.

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