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FIRMWARE VERSION 1.0.1.38 GXV3175V2 USER MANUAL Page 56 of 138
timer
Caller Request Timer
The default setting is Yes. If Yes is selected, the phone will use the session
timer when it makes outbound calls if remote party supports session timer.
Callee Request Timer
If Yes is selected, the phone will use the session timer when it receives
inbound calls with session timer request.
Force Timer
If Yes is selected, the timer will be activated even if the other party does not
support session timers. If No is selected, the timer will be activated only if
the other party supports the timer. To disable the timer, Caller Request timer,
Callee request timer and Force Timer should all be set to 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. The default setting is No.
SIP Transport
Selects the SIP transport method. There are three types: TCP, UDP and
TLS.
Symmetric RTP
Selects whether or not symmetric RTP is supported.
Support SIP Instance ID
Selects whether or not SIP Instance ID is supported.
Validate Incoming
Messages
This configuration selects whether or not the incoming messages should be
validated.
Check SIP User ID for
Incoming INVITE
Default is No. Check the incoming SIP User ID in Request URI. If they don’t match,
the call will be rejected. If this option is enabled, the device will not be able to make
direct IP calls.
Authenticate Incoming
INVITE
Default is No. When enabled, device will challenge the INVITE for
authentication with SIP 401 Unauthorized reponse.
Only Accept SIP Requests
from Known Servers
Default is No. When enabled, device will reject those SIP requests not
coming from the configured SIP Server and Outbound Proxy.
SIP T1 Timeout
This configures the timeout period for SIP T1. The default setting is 0.5
Seconds.
SIP T2 Interval
This configures the time interval for SIP T2. The default setting is 4 seconds.
Remove OBP from route
The SIP Extension notifies the SIP server that it is behind a NAT/firewall.
Account/Codec Settings
DTMF
Assigns the mechanism to send DTMF. There are three supported modes:
in audio (with DTMF as audio signals), through RTP and through SIP INFO.
DTMF Payload Type
Sends DTMF using RFC2833. The default is 101.
56


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