Feature rich ñ Features available are typically greater in both quantity and complexity.
SIP ñ The integration of a SIP trunk offers free call packages and calls using IP. This provides cheaper call costs than routing calls over analogue lines.
Ownership ñ Having something tangible that you can call your own.
No single point of failure ñ Typically multiple analogue and SIP lines are used to route calls, this presents multiple options if a single line was to go down or develop a fault.
Unified Communications ñ Onsite phone systems today facilitate so much more than just phone calls. They include capabilities of instant messaging, video conferencing, voice conferencing and visual voicemail.