D-Link DMI-128ESU Benutzerhandbuch

D-LINK ISDN TA DMI-128ESU+ 

47 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

Does incoming tone appear 
during calls? 

Confirm local switch 
provides Call Waiting 

Make sure that when 
hang up or use the 
“flash” key to switch 
calls, the duration is 
about one second. 

Yes 

No