If there is only one FXO port connected to PSTN line, use the following settings for auto-detection. 
 
Figure 110: UCM6200 PSTN Detection: Semi-Auto Detect 
 
Detect Model: Semi-auto Detect. 
Source Channel: The source channel to be detected. 
Destination Number: The number to be dialed for detecting. This number could be a cell phone number 
or other PSTN number that can be reached from the source channel PSTN number. 
 
5.  Click "Detect" to start detecting. The source channel will initiate a call to the destination number. For "Auto 
Detect", the call will be automatically answered. For "Semi-auto Detect", the UCM6200 web GUI will display 
prompt to notify the user to answer or hang up the call to finish the detecting process. 
 
6.  Once done, the detected result will show. Users could save the detecting result as the current UCM6200 
settings. 
 
Table 52: PSTN Detection for Analog Trunk 
Select "Auto Detect" or "Semi-auto Detect" for PSTN detection. 
  Auto Detect 
Please  make  sure  two  or  more  channels  are  connected  to  the 
UCM6200 and in idle status before starting the detection. During the 
detection, one channel will be used as caller (Source Channel) and 
another  channel  will  be  used  as  callee  (Destination  Channel).  The 
UCM6200 will control the call to be established and hang up between 
caller and callee to finish the detection. 
  Semi-auto Detect 
Semi-auto  detection  requires  answering  or  hanging  up  the  call