There are multiple ways to configure this device but the most simple requires 3 items, proxy, username and password for each line.
choose admin--> advanced --> voice --> line1
go to Proxy and Registration, enter the IP address or name of your IP pbx
go to subscriber info and enter the username (usually the extension) and password.
Once you have tested one line this way, you can change other parms as needed (display name to change the caller ID for instance)
repeat for line2, 3, etc. giving each one a separate extension on your pbx.
the configuration guide is here
http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/csbpvga/ata/administration/guide/ATA_AG_v3_NC-WEB.pdf
Flag helpful posts, Please.
Dan
