Grandstream Networks HT881

SDES:https://tools.ietf.org/html/rfc4568
SRTP:https://www.ietf.org/rfc/rfc3711.txt
SRTP Key Length Allows users to select supported SRTP Key Length. the available values are :
Crypto Life Time Adds crypto life time header to SRTP packets. Default is Yes.
Analog signal line conguration
SLIC Setting Depends on standard phone type (and location).
Caller ID Scheme Selects the caller id scheme, for example: Bellcore/Telcordia, ETSI-FSK …
Polarity Reversal
Reverses the polarity upon call establishment and termination.
Default isNo.
Loop Current Disconnect
Allows the traditional PBX used with HT841/HT881 to apply this method for signaling call termination. The
method initiates a short voltage drop on the line when the remote (VoIP) side disconnects an active call. The
default is No.
Play busy/reorder tone before Loop
Current Disconnect
Allow user to congure if it will play busy/reorder tone before loop current disconnect upon call fail.
Default isNo.
Loop Current Disconnect Duration
Congures the duration of voltage drop described in the topic above. HT841/HT881 support a duration range
from 100 to 10000ms. The default value is200.
Enable Pulse Dialing Allow users to enable Pulse Dialing option under FXS Port. Default is No.
Pulse Dialing Standard
Allows users to use Swedish pulse dialing standard or New Zealand pulse dialing standard.
Default isGeneral Standard.
Enable Hook Flash Enables the FLASH button to be used for terminating calls. Default is Yes.
Hook Flash Timing
Denes the 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.
HT841/HT881 support a range from 40 to 2000 ms.
Default values are300minimum and1100maximum.
On Hook Timing
Species the on-hook time for an on-hook event to be validated. HT841/HT881 support a range from 40 to
2000 ms. Default value is 400.
Gain
Adjusts the voice path volume.

•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 using the Rx gain level parameter and the Tx gain level parameter located on
the FXS port conguration 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 conguration 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 conguration PAGE.
Disable Line Echo Canceller (LEC)
Disables the LEC per call base. Recommended for Fax/Data calls.
Default isNo.
Enable High Ring Power Congures a high ringing voltage output for the device.