user manual

Grandstream Networks, Inc. GXV3175 USER MANUAL Page 51 of 119
FIRMWARE VERSION 1.0.0.32 Updated : 12/2010
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 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
to use H.264.
H.264Payload type Selects the dynamic H.264 codec payload type (ranges from 96-127). The
default setting is 99.