Avaya 1230 - TCP;TLS Operation Overview

and the user presses the Apply context-sensitive soft key, one of the following error message
appears:
- Error: User ID size: 4-12 – appears if a valid user ID is not provided.
- Error: Password size: Enter [4..11] chars – appears if a valid password is not
provided.
-
Error: User ID size: 4-12 Error: Password size: Enter [4..11] chars
– appear if both a valid user ID and a valid password are not provided.
TCP/TLS operation overview
TCP is the alternative protocol the IP Deskphone uses when sending and receiving SIP requests.
Avaya recommends TCP for Avaya SIP-enabled entities.
When a server initiates a TCP or TLS connection to the IP Deskphone, the connection only lasts as
long as the server chooses to keep the connection open; a persistent connection is not maintained
by the IP Deskphone.
How the IP Deskphone uses TCP
TCP is a connection-based protocol, which means the IP Deskphone must first establish a
connection with a target. This is done using a three-way handshake. After the handshake process is
complete and a connection is made, the IP Deskphone can send data over the TCP connection. The
data, which makes up a SIP request, can now be sent and received by either side of the
communication.
How the IP Deskphone uses TLS
Transport Level Security (TLS) is a protocol for establishing a secure connection between two end-
points. After a connection is established using TCP, TLS negotiates the cryptographic parameters
used to secure the traffic that is sent over that connection. TLS, Public Key Cryptography, and X.
509 certificates provide either mutual or server authentication.
• Mutual authentication occurs when both the client and the server have public key certificates
assigned, that are used during the TLS handshake, to validate the identity of both
communicating parties. Both the server and the end point device certificates are "signed" by
well-known trusted certificate authorities.
• Server authentication occurs when a server has a certificate signed by a certificate authority.
The certificate is only used for the client to validate the identity of the server it is connected to.
After the TLS connection is established, the server can identify the IP Deskphone through a
user name and password.
TCP/TLS operation overview
March 2015 SIP Software for Avaya 1200 Series IP Deskphones-Administration 283
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