To use Orator VoIP with Vonage, you need an "add-on" service called "Vonage SoftPhone Line Plan". They will not provide the user name and password necessary without this plan. Replace the user name and password shown with your settings. Vonage provides unlimited number of simultaneous incoming calls per account.
If you are behind a router using NAT, you may need to add the following setting under the advanced tab:
An alternate SIP server for Vonage is also:
Sip Server: sphone1.voncp.com