82  VoIP Subscriber Gateways 
 
-  Gain  receive  (x0.1dB)  –  received  signal  gain  (transmitted  into  the  phone  handset), 
measurement unit—0.1dB;  
-  Gain  transmit  (x0.1dB)  –  transmitted  signal  gain  (received  by  the  phone  handset 
microphone), measurement unit—0.1dB; 
-  Min pulse – configuration is required for pulse dialling mode; 
-  Interdigit – configuration is required for pulse dialling mode; 
-  Caller-ID  generation  –  select  mode  for  Caller  ID  generation.  For  Caller  ID  operation, 
subscriber's phone unit must support the selected method. 
  Off - Caller ID is disabled; 
  Dtmf–DTMF Caller ID method. Issuing a number is made after each call on the line 
with dual-frequency DTMF signals; 
  FSK BELL 202, FSK V.23 – FSK Caller ID method (using BELL 202 standard, or ITU-T 
V.23).  The  number  is  served  between  the  first  and  second  calls  on  the  line  by  a 
stream of data with a frequency modulation. 
  Rus AON–'Russian Caller ID' method. A number is issued by ‘Caller ID’ request signal 
of callee phone; 
To  enable  Caller  ID  information  reception,  connected  phone  unit  should  support  the   
configured Caller ID method. 
In  FSK  BELL  202  and  FSK  V.23  modes,  Caller  ID  information  is  sent  in  SDMF  format:  
time/data and number. 
-  Hangup timeout, sec – dialing timeout for the first digit of a number. When there is no 
dialing  during  the  specified  time,  'busy'  tone  will  be  sent  to  the  subscriber,  and  the 
dialing will end; 
-  Busy  timeout,  sec  –  launches  when  an  incoming  call  is  received  and  defines  the 
maximum call response time. When the defined timeout expires, busy tone will be sent 
to the remote subscriber. 
-  Ringback timeout, sec – 'busy' tone timeout for the subscriber. If the subscriber doesn't 
put the phone on-hook until the timeout expires, an error tone will be sent into the line.  
-  Payphone – port operates in payphone mode: 
  Off – normal mode, paypnone is disabled; 
  Polarity reversal –  payphone operation mode with polarity  reversal. Perform line 
power polarity reversal on subscriber's response, and return it to original state on;