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4-40 41-001160-03, Rev 00, Releaes 2.4
IP Phone Administrator Guide
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.
3The “Local SIP TLS Port” field has a default value of 5061. Change this value if required to a value
greater than 1024 and less than 65535.
Note: It is recommended that you avoid the conflict with any TCP ports being used. For example:
WebUI HTTP server on 80/tcp and HTTPS on 443/tcp.
4 Click to save your changes.
Note: HTTPS uses port 443 instead of HTTP port 80 in its interactions
with the TCP/IP lower layer.
Aastra Web UI
Draft 1