Aastra Telecom 57I C53I manual Https Client/Server Configuration

IP Phone Administrator Guide Advanced Network Settings

Configuring the IP Phones

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.

Note: HTTPS uses port 443 instead of HTTP port 80 in its interactions with the TCP/IP lower layer.

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

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