Avaya 1230 - Page 292

Configuration Description Expected result Possible results
IP Deskphone: TCP +
TLS Server: UDP +
TCP + TLS
The IP Deskphone
attempts to contact the
server using TLS first,
because TLS has
higher priority than
TCP.
The IP Deskphone
registers the same as
if it was configured for
TLS only.
If the IP Deskphone is unable to
connect to the server using
TLS, it attempts to connect
using TCP. If attempts to
connect using TLS and TCP
fail, the IP Deskphone waits a
configured period of time before
attempting to reconnect.
IP Deskphone: UDP +
TCP + TLS Server:
UDP + TCP + TLS
The IP Deskphone
attempts to contact the
server using TLS first,
because TLS has
higher priority than TCP
and UDP.
The IP Deskphone
registers the same as
if it was configured for
TLS only.
If the IP Deskphone is unable to
connect to the server using
TLS, it attempts to connect
using TCP. If attempts to
connect using TLS and TCP
fail, the IP Deskphone attempts
to connect using UDP. If
attempts using TLS, TCP, and
UDP fail, the IP Deskphone
waits a configured period of
time before attempting to
reconnect.
None: unsupported Unsupported Unsupported Unsupported
Note:
The server must be configured with the appropriate protocols enabled for the success condition
to be realized. Failure results are possible if the server configuration is changed to disallow
protocols.
Managing connection persistence
The IP Deskphone attempts to establish and maintain a persistent connection with the proxy when
TCP and TLS are active protocols. After this connection is established, the IP Deskphone sends all
outgoing connections over this persistent connection.
SIP IP Deskphones and servers, which use UDP to communicate, listen for incoming connections
on known ports, and originate each request on a randomly selected UDP port. Even if TCP is used,
new requests can potentially be sent using a new source port unless the connection between the IP
Deskphone and proxy is kept active.
Connection persistence does the following:
• Keeps a connection established between a client and the outgoing proxy.
• Reuses the open connection for future incoming and outgoing requests.
Security
292 SIP Software for Avaya 1200 Series IP Deskphones-Administration March 2015
Comments? infodev@avaya.com