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Grandstream Networks, Inc. 

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Configuration option for all FXS ports ring cadence for all incoming calls. (Syntax: c=on1/off1-
on2/off2-on3/off3; [...]) Default is set to c=2000/4000; (US standards) 

Using these settings, user can configure tone frequencies according to user preference. By 
default, the tones are set to North American frequencies. Frequencies should be configured with 
known values to avoid uncomfortable high pitch sounds. ONis the period of ringing (ON time in 
ms) while OFF is the period of silence. In order to set a continuous ring, OFF should be zero. 
Otherwise it will ring ON ms and a pause of OFF ms and then repeat the pattern. 

• “Dial tone” 
• “Ringback tone” 
• “Busy/Re-order tone” 
• “Confirmation tone” 

Please refer the document below to determine your local call progress tones: 
http://www.itu.int/ITU-T/inr/forms/files/tones-0203.pdf 

If set to “Yes”, the configuration update via keypad is disabled. 

Disables the voice prompt configuration.  Default is “No”. If set to “Yes” accessing integrated 
voice menu will be impossible. 

Disables the Direct IP Call function.  Default is “No”.  If set to “Yes” to make direct IP call will be 
impossible. 

Life line feature ensures user can place/receive a PSTN call in an emergency situation. 

1.  If set to “Auto”, in case of power loss or loss of SIP registration, the PSTN line will be 

seamlessly connected to analog phone connected to FXS port. 

2.  If set to “Always Connected” the PSTN line will be always connected to the phone 

connected to FXS port. VoIP calls will not be allowed in this configuration. 

3.  If set to “Always Disconnected”, user can only place VoIP calls, regardless of any 

power loss and/or SIP registration problems. User will be unable to place/receive any 
PSTN calls.             

This feature allows users to place an outgoing PSTN call in case there is a loss of registration 
(SIP server unreachable) of all FXS profiles. If set to “YES”, when GW recognizes a loss of 
registration, all outgoing calls will be routed over the to preconfigured FXO gateway. 

IP Address or URI of the FXO GW. 

URI or IP address of the NTP (Network Time Protocol) server.  Used by the phone to synchronize 
the date and time.  

The IP address or URL of System log server.  This feature is especially useful for the ITSP 
(Internet Telephone Service Provider)