A Hosted PBX service is a hosted IP telephony solution using Voice over IP to transport calls over public or private IP networks. Hosted PBX services are used by businesses to provide local and long distance voice service as well a hosted PBX phone system for calling features. Hosted PBX service provides increased efficiency by utilizing IP network access for VOIP calls and a hosted PBX system regardless of location, and without the need for traditional phone service or onsite PBX system. A business hosted PBX service offers the same benefits and features as a traditional PBX and phone service, including caller ID, Direct Inward Dialing (DID), 800 numbers, voicemail, auto attendant, and other calling features. Hosted IP PBX service is available in a variety of configurations including analog & digital trunks, ISDN PRI, T1, and SIP handoff. Hosted IP PBX service is also known as Hosted VOIP PBX, Virtual PBX VOIP, Hosted IP Telephony, SIP VOIP, or Virtual PBX Systems.