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Operational, Basic, and Advanced Parameters
A-89 41-001343-02 REV04 – 05.2014
Transport Layer Security (TLS) Settings
To configure TLS, you must enter the “sip transport protocol” parameter with a value of “4” (TLS). See the “sip transport
protocol” description on pageA-84.
Also enter the following parameters in the configuration files to configure TLS:
Parameter –
sips persistent tls
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
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:
• There can be only one persistent TLS connection created per phone.
• If you configure the phone to use Persistent TLS, you must also specify the Trusted Cer-
tificate 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
Parameter –
sip persistent tls keep alive
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description When enabled, the configured value indicates frequency (in seconds) that phone will
send the keep alive messages.
Format Integer
Default Value 0 (Disabled)
Range 0-3600
Example sip persistent tls keep alive: 10
Parameter–
sip send sips over tls
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description Allows administrators the ability to manually configure the IP phones to use either the SIP
or SIPS URI scheme when TLS or persistent TLS is enabled
Format Integer
Default Value 1 (Enabled)
Range 0-1
0 (Disabled - Use SIP URI scheme)
1 (Enabled - Use SIPS URI scheme)
Example sip send sips over tls: 0