Grandstream HT503 User Manual - Manual (Page 50)

FIRMWARE VERSION 1.0.14.1 HT503 USER MANUAL Page 48 of 64
SRTP Mode Secure RTP protocol used for media transmission over VoIP. Disabled by default.
Other modes are: enabled but not forced & enabled and forced.
Crypto Life Time Default is Enabled. Allows user to enable or disable Crypto life time when using SRTP.
SLIC Setting Dependent on standard phone type (and location).
Called ID Scheme Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, & NTT Japan
Caller ID TX Level (dB) A value of level for Caller ID information sent by a FXS port to phone connected to it.
(-40 – 0dB. Default -20dB)
Polarity Reversal If set to “Yes”, polarity will be reversed upon call establishment and termination.
Default is No.
Loop Current Disconnect Set it to “Yes” of the traditional PBX you are using with HT503 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.
Loop Current Disconnect
Duration
A configurable period of time in which the FXS port will drop off voltage on the line to
indicate to the local party that the call is disconnected from the remote side.
(100-10000 ms. Default 200 ms)
Enable Hook Flash Default is Yes. If set to “No”, FLASH button could only be used for terminating calls.
Hook Flash Timing The time period when the cradle is pressed (Hook Flash) to simulate a FLASH. Adjust
this time value to prevent unwanted activation of the Flash/Hold and automatic phone
ring-back.
On Hook Timing On-hook timing is the minimum time for an on-hook event to be validated.
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 or tone frequencies according to preference. By
default tones are set to North American frequencies. Frequencies should be configured
with known values to avoid high pitch sounds.