Manual Grandstream GXW400x Series (page 53 of 60) (English)

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FIRMWARE VERSION 1.0.8.4 GXW40XX USER MANUAL Page 53 of 60

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.

Proxy-Require

SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.

Enable Hook Flash

Default is Yes. If set to “No”, FLASH button could only be used for terminating calls.

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Grandstream GXW400x Series Manual

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