For IP phone systems that support Direct Inward Dialing (DID), order as many phone numbers you like at $5/month for each number orderd. This works in conjuction with at least 1 Channel with a primary number and as many extra channels as needed for desired number of concurrent calls.
For this level of savings we bill $15.00 for the Quarter (3 months of service) in advance rather than bill after the fact. There is no contract required and you can stop the service at any time and we prorate the service and refund the unused portion.
Allworx, Syspine & AastraLink Response Point and AastraLink Pro 160 supports DID numbers. Talkswitch does not.