Grandstream GXW400x User Manual Manual de usuario descargar pdf (Pagina 54)

FIRMWARE VERSION 1.0.14.1 GXW400X USER MANUAL Page 52 of 60

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

Crypto Life Time

Default is Enabled. Allows user to enable or disable Crypto life time when using SRTP.

SLIC Setting

Depends on standard phone type (and location).

Caller ID Scheme

Select the value according to the local Telco standard where the GXW400X 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 GXW400X uses this method for

signaling call termination. Default is No.

Play busy/reorder tone

before Loop Current

Disconnect

Default is No. If set to Yes, it will play busy/reorder tone before loop current disconnect

upon call fail.

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Grandstream GXW400x User Manual Manual de usuario Pagina 54

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