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View General Telephone Settings

Select Telephony directory to access the General Telephony Settings Screen.

Telephony Directory

General Telephony Settings



Secure Relay

Software/Hardware Secure Voice
STU-III De-Scrambler

Enable/Disable the STU-III scrambler.
This setting only applies to STU-III calls not STU-llb or FNBDT. Disable this only if using very old STU-III devices that do not conform to the standard descrambler.
The descrambler is the modem descrambler. VX does not attempt to decrypt the Secure Voice Signal.

DC Filter

Enable or disable the DC filter

Clock Rate Compensator

Dynamically adjusts clock rate for synchronous secure voice. Calls to compensate for slightly different end-to-end clocks or clock drift.

V.14 Auto Detection

Enable this option will save bandwidth by not transmitting V.14 start and stop bits on a media stream if V.14 is present on the modem side
Disabling this option will always strip the V.14 start and stop bits regardless of whether V.14 is detected on the modem side
Default = Enable

SCIP Framing

Enabling this option allows SCIP devices to work over higher packet loss environments
It also provides more efficient bandwidth use with SCIP devices

MLPP Diversion

Enable Diversion

Select this checkbox to enable MLPP diversion which specifies that a call that cannot be connected be diverted to an attendant but must be sent to a predetermined number.

Minimum Precedence

Specifies the minimum precedence level to apply to the Diversion timer.

Diversion Timeout

Specifies the number of seconds that a precedence call connection will be attempted before redirecting the call to the attendant. Valid range is 5-180 seconds. Specify Disabled to turn the timeout feature off.

Destination Number

Specifies the attendant phone number. This is the number that unanswered precedence calls will be diverted to.

Comfort Noise

Send CN RTP packets

In codecs that don't support silence, specifies the behavior of the comfort noise packets when silence is enabled.
Enabled = Always send CN packets
Disabled = Never send CN packets
Negotiated (default) = Send CN packets if the payload is negotiated by the SIP call

Generate TDM CN on Media stream absence


Select this check-box to enable comfort noise when there is no media stream. This triggers the DSP to generate comfort noise if the media stream stops without explicitly requesting it. You specify the duration to wait for new RTP packets and the level of the comfort noise to generate.

Comfort Noise Level

Specifies the comfort noise level in -dBov.

Media stream timeout

Specifies the amount of time (in milliseconds) that the media stream can be absent before playing the comfort noise.


T.38 Fax Redundancy

Specifies the number of redundant T.38 packets to send.

T.38 CNG Detect

Select this check-box to enable or disable this feature.

Fax/Modem bypass on PCM

Select this check-box to disable the echo canceler when a fax or modem tone is detected.
Only works with G.711 (codec) based calls

RFC 2833 Events: Mute audio during events

Enabling this drops the voice RTP packets during RFC2833 packet generation.

Limited Capacity – Improved latency

If this is enabled the DSP has low latency, but it can affect performance in case of a heavy load. It improves Audio Quality.

RTP Port

First Port

Configure first port in RTP port range. Valid entry: even number between > = 16384 and < 32767

Last Port

Configure last port in RTP port range. Valid entry: even number between > 16384 and < = 32767