Grandstream Networks GXW40XX user manual Vad

iLBC Payload type	Default value is 97. Defines payload type for iLBC. The valid range is between 96 and
	127.
AAL2-G726-16	Default value is 100. Range is from 96 to 127.
Payload type
AAL2-G726-24	Default value is 99. Range is from 96 to 127.
Payload type
AAL2-G726-32	Default value is 104. Range is from 96 to 127.
Payload type
AAL2-G726-40	Default value is 103. Range is from 96 to 127.
Payload type
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	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.
		• 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	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
Grandstream Networks, Inc.		GXW40XX User Manual	Page 34 of 38
		Firmware 1.0.4.2	Last Updated: 06/2011