AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 204)

41-001343-01 Rev 03, Release 3.2.2 4-41
HTTPS Client/Server Configuration
HTTPS is a Web protocol that encrypts and decrypts user page requests as well as the pages that
are returned by the Web server. HTTPS uses Secure Socket Layer (SSL) or Transport Layer
Security (TLS) as a sublayer under its regular HTTP application layering. SSL is a
commonly-used protocol for managing the security of a message transmission on the
Internet. It uses a 40-bit key size for the RC4 stream encryption algorithm, which is considered an
adequate degree of encryption for commercial exchange. TLS is a protocol that ensures privacy
between communicating applications and their users on the Internet. When a server and client
communicate, TLS ensures that no third party may eavesdrop or tamper with any message. TLS is
the successor to SSL.
When an HTTPS client opens and closes its TCP socket, the SSL software respectively
handshakes upon opening and disconnects upon closing from the HTTPS server. The main HTTPS
client functions are:
• Downloading of configuration files and firmware images.
• Downloading of script files based on an “HTTPS://” URL supplied by a softkey definition.
The HTTPS server provides HTTP functionality over secure connections. It coexists with the
HTTP server but has its own set of tasks. The main HTTPS server functions are:
• Delivery of web page content to a browser client over a secure connection.
• Execution of HTTP GET and POST requests received over a secure connection.
Using the configuration files, the IP phone UI, or the Aastra Web UI, you can configure the
following regarding HTTPS:
• Specify HTTPS security client method to use (TSLv1 or SSLv3)
• Enable or disable HTTP to HTTPS server redirect function
• HTTPS server blocking of XML HTTP POSTS to the phone
Configuring HTTPS Client and Server Settings
Use the following procedures to configure the HTTPS client and server for the IP phones.
Note: HTTPS uses port 443 instead of HTTP port 80 in its interactions
with the TCP/IP lower layer.
Note: To enable or disable the IP phones to use the HTTPS protocol as
the configuration server, see the section, “Configuring the Configuration
Server Protocol” on page 4-104 .
Configuration Files
For specific parameters you can set in the configuration files, see Appendix A, the section, “HTTPS Client
and Server Settings” on page A-37.