Grandstream Networks GXV33 Series Administration Guide

GXV3370 Administration Guide
Version 1.0.1.12
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• In audio, which means DTMF is combined in the audio signal (not very
reliable with low-bit-rate codecs);
• RFC2833, which means to specify DTMF with RTP packet. Users could
know the packet is DTMF in the RTP header as well as the type of DTMF.
• SIP INFO, which uses SIP INFO to carry DTMF. The defect of this mode
is that it's easily to cause desynchronized of DTMF and media packet if the
SIP and RTP messages are required to transmitted respectively.
The default setting is "RFC2833".
DTMF Payload Type
Configures the RTP payload type that indicates the transmitted packet
contains DTMF digits. Valid range is from 96 to 126. Default value is 101.
Jitter Buffer Type
Selects either Fixed or Adaptive based on network conditions.
Enable Audio RED with
FEC
If set to "Yes", FEC will be enabled for audio call. The default setting is
"No".
Audio FEC Payload Type
Configures audio FEC payload type. The valid range is from 96 to 126. The
default value is 121.
Audio RED Payload
Type
Configures audio RED payload type. The valid range is from 96 to 126. The
default value is 124.
Silence Suppression
Enables the silence suppression/VAD feature. If it is set to “Yes”, when
silence is detected, a small quantity of VAD packets (instead of audio
packets) will be sent during the period of no talking. If set to “No”, this
feature is disabled. The default setting is “No”.
Voice Frames Per TX
Configures the number of voice frames transmitted per packet. When
configuring this, it should be noted that the “ptime” value for the SDP will
change with different configurations here. This value is related to the codec
used and the actual frames transmitted during the in payload call. For end
users, it is recommended to use the default setting, as incorrect settings
may influence the audio quality. The default setting is 2.
Preferred Video Codec
Preferred Video Codec
Lists the available and enabled Video codecs for this account. Users can
enable the specific video codecs by moving them to the selected box and
set them with a priority order from top to bottom. This configuration will be
included with the same preference order in the SIP SDP message.
Enable Video FEC
When enabled, the video sender will temporarily allocate part of the
bandwidth to one data channel to send FEC data to system, thus to
improve the video quality the receiver gets. Enabling this function will take
up part of bandwidth and reduce call rate. The default setting is "Yes".
Enable RFC5168
Support
Enables/disables RFC5168 mechanism for video calls. RFC5168 allows
SIP party to request the sender to refresh its video frame in H.264, or
refresh the full picture in VP8.The default setting is “No”.

Grandstream Networks GXV33 Series Specifications

General

Brand	Grandstream Networks
Model	GXV33 Series
Category	IP Phone
Language	English