The investment in VoIP SIP trunks can generate a quick and substantial return-on-investment (ROI), since with a SIP trunk connected directly to the telephony service provider, the end user can dispense with costly ISDN BRIs and PRIs, replacing them with service that can cost significantly less. In most cases, the PBX must be an IP-based PBX, communicating with all endpoints over IP, but it may just as well be a traditional digital or analog PBX. The requirements are that an interface for SIP trunking connectivity is available (Ethernet interface) and the SIP protocol is supported.
We gave life to our first virtual PBX in 2008 and we’ve been continuously adding capabilities since. Our features include professional greetings, music on hold, custom auto-attendant, call forwarding, fax with no fax machine, queuing, call recording, conferencing and the list goes on and on!