78  VoIP Subscriber Gateways 
 
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; 
-  Ringback timeout, sec – 'busy' tone timeout for the subscriber. If the subscriber doesn't 
put the phone onhook until the timeout expires, an error tone will be sent into the line. 
-  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. 
-  Payphone – port operates in payphone mode: 
  Off – normal mode, payphone 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; 
  12 kHz – when there is an outgoing call, tariff pulse with 12 kHz frequency will be 
sent in the line one time per second; 
  16 kHz – when there is an outgoing call, tariff pulse with 16 kHz frequency will be 
sent in the line one time per second; 
-  Rx  AGC  –  when  selected,  a  received  signal  will  be  amplified  to  the  specified  level 
(maximum signal  amplification  is +/- 15  dB), otherwise—the  amplification will not  be 
carried out. 
-  Rx  AGC  Level –  determines the value of the level to which an analogue signal will be 
amplified when receiving (allowed values: -25, -22, -19, -16, -13, -10, -7, -4, -1 dB). 
-  Tx  AGC  –  when selected, a  transmitted  signal  will  be  amplified  to  the  specified level 
(maximum signal  amplification  is +/- 15  dB), otherwise—the  amplification will  not  be 
carried out; 
-  Tx  AGC  Level  – determines the value of the level to which an  analogue signal will be 
amplified when transmitting (allowed values: -25, -22, -19, -16, -13, -10, -7, -4, -1 dB). 
-  Stop  dialing  #  –  when  selected, use  #  button  on  the  phone  unit  to  end  the  dialling, 
otherwise # will be recognized as a part of the number.