User's Manual

Grandstream Networks, Inc. GXW40XX User Manual Page 34 of 39
Firmware 1.0.4.2 Last Updated: 06/2011
AAL2-G726-40
Payload type
Default value is 103. Range is from 96 to 127.
G729E payload type Default value is 102. Range is from 96 to 127.
VAD Default is No. VAD allows detecting the absence of audio and conserve bandwidth by
preventing the transmission of "silent packets" over the network.
Symmetric RTP Default is No. When set to Yes the device will change the destination to send RTP
packets to the source IP address and port of the inbound RTP packet last received by
the device.
Fax Mode
T.38 (Auto Detect) FoIP by default, or Pass-Through (must use codec PCMU/PCMA)
Fax Tone Detection
Mode
Default is Callee. This decides whether Caller or Callee sends out the re-INVITE for
T.38 or Fax Pass Through.
Jitter Buffer Type
Select either Fixed or Adaptive based on network conditions.
Jitter Buffer Length
Select Low, Medium or High based on network conditions.
• High (initial 200ms, min 40ms, max 600ms) Note: not all vocoders can meet the
high requirement
• Medium (initial 100ms, min 20ms, max 200ms)
• Low (initial 50ms, min 10ms, max 100ms)
SRTP Mode Default is Disabled. Other options are Enabled but not forced, and Enabled and
forced.
It uses SDP Security Description to exchange key. Please refer
SDES: http://www.apps.ietf.org/rfc/rfc4568.html
SRTP: http://www.apps.ietf.org/rfc/rfc3711.html
SLIC Setting
Depends on standard phone type (and location)
Caller ID Scheme
Select the value according to the local Telco standard where the GXW40XX is installed.
Please refer to the pull down list to select.
Polarity Reversal Default is No. If set to “Yes”, polarity will be reversed upon call establishment and
termination.
Loop Current
Disconnect
Set to Yes if the traditional PBX you are using with GXW40XX uses this method for
signaling call termination. Default is No.
Loop Current
Disconnect duration
Default is 200. In 100 - 1 0000 milliseconds range.
Hook Flash timing
Time period when the cradle is pressed (Hook Flash) to simulate FLASH. To prevent
unwanted activation of the Flash/Hold and automatic phone ring-back, adjust this time
value.
On Hook Timing
On-hook timing is the minimum time for an on-hook event to be validated.
Gain
Handset volume adjustment. RX is for receiving volume (direction FXSÆto analog
phone), TX is for transmission volume (Analog phoneÆ to FXS). Default values are
0dB for both parameters. Loudest volume: +6dB Lowest volume: -6dB.
Ring Tones
Configure ring cadences according to preference.