SKY SYS now offers VOIP at $19.95 monthly per user, Includes many features:

Mobile App ● Virtual receptionist ● Call park ● Ring groups ● Music on hold ● Transfer music ● Extension dialing ● Voicemail ● Call transfer ● Call log ● One conference bridge per user ● Extension-to-extension dialing ● Forward calls during device outages ● One virtual fax per user ● 7-digit dialing ● Call Blocking ● Intercom ● Smart phone app: 2-phones-in-1 ● Call forwarding ● Multi-device ring ● Virtual extensions ● Voicemail audio email attachments ● SMS Messaging ● Call Flip ● Overhead Paging

Download overview features PDF.