The default user name and password are “Admin”. Note that the user name and the password fields are case sensitive.
Under “Protocol Management / End Points Phone Numbers” you can check the phone numbers according to the analog ports.
Under “Protocol Management / Protocol Definition” check the parameter “Channel Select Mode”. This must set to “By Phone Number”.
If this all will not help, you have to take a connection trace “Status & Diagnostics / Message Log”. There you will find the error messages.