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41-001343-01 Rev 02, Release 3.2.2
TLS Support
The IP Phones support a transport protocol called
Transport Layer Security (TLS)
and
Persistent TLS
. TLS is a protocol that ensures communication privacy between the SIP phones
and the Internet. TLS ensures that no third party may eavesdrop or tamper with any message. An
Administrator can configure the following parameters for TLS Support.
Parameter
In
IP Phone UI
Parameter in
Aastra Web UI
Parameters in
Configuration Files
Description
N/A
Transport Protocol
sip transport protocol
Specifies the protocol that the RTP port on the IP phone
uses to send out SIP signaling packets. Default is USP.
Notes
:
1.
If you set the value of this parameter to 4 (TLS), the
phone checks to see if the “
sips persistent tls
” is
enabled. If it is enabled, the phone uses Persistent TLS on
the connection. If “
sips persistent tls
” is disabled, then
the phone uses TLS on the connection. If TLS is used, you
must specify the Root and Intermediate Certificates, the
Local Certificate, the Private Key, and the Trusted
Certificates.
2.
If the phone uses Persistent TLS, you MUST specify
the Trusted Certificates; the Root and Intermediate
Certificates, the Local Certificate, and the Private Key are
optional.
For more information, see Chapter 6, the section,
“Transport Layer Security (TLS)”
on
page 6-26
.
N/A
N/A
sips persistent tls
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.
For more information, see Chapter 6, the section,
“Transport Layer Security (TLS)”
on
page 6-26
.
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