Specifications

Chapter 2: Getting Started 15
•
Enable AAuthentication
: Click this check box to enable authentication or uncheck it to disable
authentication. (Authentication is required if the proxy requires it.) Authentication verifies the username and
password as entered in the
Authorization uuser
and
Authorization ppassword
fields. These fields are active only
when authentication is enabled and can thus be modified. When authentication is disabled, these fields
are inactive.
•
Enable SSIP Proxy rregistration
: Click this check box to enable SIP proxy registration or uncheck it to disable
it. SIP proxy registration is the connection to the SIP proxy server in a SIP-based IP telephony environment
that handles call control and serves as the central repository for address translation (name to IP address).
When SIP proxy registration is enabled, the
Proxy sserver IIP aaddress/URL
and
Proxy pport
fields are active. Enter
the required IP address/URL of the SIP proxy server and the number of the SIP proxy port. When SIP proxy
registration is disabled, these fields are inactive.
•
Enable OOutbound pproxy
: Click this check box to enable the outbound proxy server or uncheck it to disable
it. The outbound proxy is the IP address to use for outbound calls if the address is different from the
registration address. When enabled, the
Outbound pproxy sserver IIP address/URL
and
Outbound pproxy pport
fields are
active. Enter the required IP address/URL of the outbound proxy server and the number of the outbound
proxy port. When disabled, these fields are inactive.
•
SIP Transport
: Click the radio button next to the type of SIP transport you wish to use and the number of
the listen port in the
Listen pport
field for the specified transport. UDP (user datagram protocol) is a protocol
within the TCP/IP protocol suite that is used in place of TCP (transmission control protocol) when a reliable
delivery is not required. UDP requires less processing of packets and is connectionless, meaning it does
not require a handshake to start a session like TCP does. Therefore, it is faster and is often used with VoIP
because there is no time to retransmit erroneous or dropped packets. The default port is 5060.
•
Enable iin BBand DDTMF RRelay
: Click the check box to enable in band DTMF (dual tone multi-frequency)
relay or uncheck the box to disable it. In band DTMF relay allows dialing information to be sent for
gateways that need to receive standard audio. DTMF relay provides a way to transport DTMF digits in an
RTP voice stream when the voice codec cannot accurately reproduce the digits, or the sender or receiver
DSP (digital signal processor) cannot perform digit sampling. Each DTMF digit is encoded as an
RTP-named event and sent as RTP packets over UDP. The packets are encoded with a payload type which
is negotiated during connection establishment. When enabled, the Payload field is active. Enter the
desired payload: values range from 96 to 127. When
Enable iin BBand DDTMF Relay
is disabled, this field is
inactive.
•
Registration ttimeout
: Enter the value (in seconds) your phone is to refresh its registration to the SIP proxy
server. The default value is 3600.
Click the
Apply
button to activate any changes made to the SIP Configuration screen.