Aastra Telecom 9480i Series User Manual

41-001160-03, Rev 00, Releaes 2.4

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Administrator Options

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.

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, 

 on 

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