User's Manual Part 2

Grandstream Networks, Inc. GXV3175 USER MANUAL Page 43 of 68
FIRMWARE VERSION 1.0.0.32 Updated : 11/2010
refresher, or select UAS to use the phone as the refresher.
Force INVITE The Session Timer can be refreshed using the INVITE or UPDATE
methods. Select “Yes” to use the INVITE method to refresh the
session 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.
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
Enable Video --YES: Accepts all incoming video, this is the default setting;
--NO: video is disabled.
--Enable/Disable during dialing: Dialing time choice to enable/disable
video
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.
Preferred Vocoder This products supports up to 8 different Vocoders: including
G.711(a/μ)(PCMU/PCMA),GSM,G726-32,G.723.1,G.729A/B, G.722
and L16-256.
When this has been configured, the system will select the preferred
vocoder from the list and the same order is sent with the SDP
messages.
The user can change the preferred vocoder priority order by toggling