User's Manual

Configuration Result Idle Screen Security Icon
Display
Default: UDP + TCP SIP is unsecured. No
UDP only SIP is unsecured. No
TCP only SIP is unsecured. No
TLS only Connection is only
established if SIP is secure.
Yes
UDP + TLS: unsupported Unsupported. Unsupported
TCP + TLS Connection is established
with either TCP or TLS.
Yes – only if TLS connection
is used
No – if fall back to TCP
occurs
UDP + TCP + TLS Connection is established
using
TCP or TLS, potentially
falling back to using only
UDP.
Yes – only if TLS connection
is established
No – if fall back to TCP or
UDP occurs
None : unsupported Unsupported Unsupported
Unsupported configurations cannot be saved. If the configurations are unsupported, the IP
Deskphone displays an error message.
The following is an example of an error message for unsupported
configurations:Unsupported: UDP + TLSUnsupported: No protocols enabled.
Registration behavior based on configuration settings
The following table describes the behavior of the IP Deskphone when the IP Deskphone is
configured to communicate with a server using specific protocols.
Table 83: Registration results based on configuration
Configuration Description Expected result Possible results
IP Deskphone:
UDP + TCP Server:
UDP + TCP + TLS
The IP Deskphone
allows protocols
enabled for
communication
with
the server.
The IP
Deskphone
establishes a
connection to the
server using TCP.
If the server does not
accept incoming requests
on TCP, it takes
approximately thirty
seconds for the initial
connection attempt to fail,
and then the IP
Deskphone attempts to
contact the server using
UDP. If this connection
also fails, the IP
Deskphone waits a
TCP/TLS operation overview
SIP Software for Avaya 1200 Series IP Deskphones-Administration September 2013 281