Aastra Telecom 53I, 57I CT, 55I manual Sips persistent tls

Configuration Parameters

Operational, Basic, and Advanced Parameters

Parameter –	Configuration Files		aastra.cfg, <mac>.cfg
sips persistent tls
Description	Enables or disables the use of Persistent Transport Layer Security (TLS).
	Persistent TLS sets up the connection to the server once and re-uses that
	connection for all calls from the phone. The setup connection for
	Persistent TLS is established during the registration of the phone. If the
	phones are set to use Persistent TLS, and a call is made from the phone,
	this call and all subsequent calls use the same authenticated connection.
	This significantly reduces the delay time when placing a call.
	Notes:
	1.	Persistent TLS requires the outbound proxy server and outbound
	proxy port parameters be configured in either the configuration files or the
	Aastra Web UI (Advanced Settings->Global SIP->Basic SIP Network
	Settings). There can be only one persistent TLS connection created per
	phone. The phone establishes the TLS connection to the configured
	outbound proxy.
	2.	If you configure the phone to use Persistent TLS, you must also
	specify the Trusted Certificate file to use. The Root and Intermediate
	Certificates, Local Certificate, and Private Key files are optional.
Format	Boolean
Default Value	0 (disabled)
Range	0 (disabled)
	1 (enabled)
Example	sips persistent tls: 1

Appendix A

41-001160-00, Release 2.1, Rev 04 A-73