Grandstream GXV3175 User Manual - Manual (Page 59)

FIRMWARE VERSION 1.0.3.76 GXV3175 USER MANUAL Page 59 of 139
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
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 with
the up and down buttons. It is recommended to use the default setting
“PCMU”; if other vocoders are chosen, there could be an audio transmission
error.
Preferred Video Codec Selects the preferred video codec from the available list. It is recommended