User's Manual
GXP2200 USER MANUAL Page 103 of 131
ACCOUNT/CODECSETTINGS
DTMF This parameter specifies the mechanism to transmit DTMF digits. There
are 3 supported modes: in audio which means DTMF is combined in the
audio signal (not very reliable with low-bit-rate codecs), via RTP
(RFC2833), or via SIP INFO.
DTMF Payload Type This parameter sets the payload type for DTMF using RFC2833. Default
is 101.
Preferred Vocoder 4 different vocoder types are supported on the phone, including G.711
A-law (PCMA), G.711 U-law (PCMU), G.722 and G.729A/B. Users can
configure vocoders in a preference list that is included with the same
preference order in SDP message. Arrange your preferred vocoder
orders using the Up and Down button.
SRTP Mode Enables the SRTP mode based on your selection from the drop-down
menu. The default setting is "Disable".
Force Timer If Force Timer is set to "Yes", the phone will use the session timer even if
the remote party does not support this feature. If Force Timer is set to
"No", the phone will enable the session timer only when the remote party
supports this feature. To turn off the session timer, select "No".
Enable 100rel The use of the PRACK (Provisional Acknowledgment) method enables
reliability to SIP provisional responses (1xx series). This is very
important in order to support PSTN internetworking. To invoke a reliable
provisional response, the 100rel tag is appended to the value of the
required header of the initial signaling messages.
SIP Transport Determines the network protocol used for the SIP transport. Users can
choose from TCP/UDP/TLS.
Symmetric RTP Defines whether symmetric RTP is supported or not. The default setting
is "No".
Support SIP Instance ID Defines whether SIP Instance ID is supported or not. The default setting
is "Yes".
Validate Incoming Messages Defines whether the incoming messages will be validated or not. The
default setting is "No".
SIP T1 Timeout SIP T1 Timeout. The default setting is 0.5 seconds.
SIP T2 interval SIP T2 Interval. The default setting is 4 seconds.
Remove OBP from route Configures to remove outbound proxy from route. This is used for the
SIP Extension to notify the SIP server that the device is behind a
NAT/Firewall.