Firmware Version 1.0.9.1 - Grandstream Networks GXW-4004 User Manual

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 Default is Callee. This decides whether Caller or Callee sends out the re-INVITE for
Mode
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.
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:
SRTP:
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.
Default is No. If set to "Yes", polarity will be reversed upon call establishment and
Polarity Reversal
termination.
Loop Current Set to Yes if the traditional PBX you are using with GXW40XX uses this method for
Disconnect signaling call termination. Default is No.
Loop Current Default is 200. In 100 - 1 0000 milliseconds range.
Disconnect duration
Proxy-Require SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.
Default is Yes. If set to "No", FLASH button could only be used for terminating calls.
Enable Hook Flash

FIRMWARE VERSION 1.0.9.1


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)
http://www.apps.ietf.org/rfc/rfc4568.html
http://www.apps.ietf.org/rfc/rfc3711.html
GXW40XX USER MANUAL Page 53 of 60