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Grandstream Networks, Inc. HT-70X User Manual Page 29 of 35
Firmware Version 1.0.0.18 Last Updated: 03/2012
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)
Re-Invite after Fax Tone
Detection Mode
Default is Enabled. It makes the unit send out the re-INVITE for T.38 or Fax Pass
Through if a fax tone is detected.
Jitter Buffer Type
Select either Fixed or Adaptive based on network conditions. Default is Adaptive.
Jitter Buffer Length
Select Low, Medium or High based on network conditions. Default is Medium.
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
This option defines different implementation of support SRTP (squired RTP)
transmission mode. Select between Disabled, Enabled but not Forced, and Enabled
and Forced. Default is Disabled.
SLIC Setting
Dependent on standard phone type (and location)
Caller ID Scheme
Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, & NTT Japan
Polarity Reversal
Default is No. If set to “Yes”, polarity will be reversed upon call establishment and
termination.
Loop Current
Disconnect
Default is No. Set it to Yes if the traditional PBX you are using with HT70X uses this
method for signaling call termination. Method initiates short voltage drop on the line
when remote (VoIP) side disconnects an active call.
Loop Current
Disconnect Duration
Default value is 200. Here can be configured duration of such voltage drop described in
topic above. HT70X supports a Duration Range from 100 to 10000 ms.
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. Default values are 300 minimum and 1100 maximum. HT70X supports a
range from 40 to 2000 ms.
On Hook Timing
On-hook timing is the minimum time for an on-hook event to be validated. Default
value is 400 . HT70X supports a range from 40 to 2000 ms.
Gain
Voice path volume adjustment.
• Rx is a gain level for signals transmitted by FXS
• Tx is a gain level for signals received by FXS.
Default = 0dB for both parameters. Loudest volume: +6dB Lowest volume: -6dB.
User can adjust volume of call on either end using the Rx Gain Level parameter and
the Tx Gain Level parameter located on the FXS Port Configuration page.
If call volume is too low when using the FXS port (ie. the ATA is at user site), adjust
volume using the Rx Gain Level parameter under the FXS Port Configuration page.
If voice volume is too low at the other end, user may increase the far end volume using
the Tx Gain Level parameter under the FXS Port Configuration page.
Disable Line Echo
Canceller (LEC)
Default is No. If set to “Yes” LEC will be disabled per call base. Recommended for
FAX/Data calls.
Ring Tones
This function lets you configure ring tone cadence preferences. User has 10 choices.
The configuration, completed in Distinctive Ring Tones block in the same page, applies
to ring tones cadences configured here.