Back in the days of wire-line telephony, when all phone calls went over the PSTN, businesses would purchase “trunks” – a dedicated line or a bundle of circuits – from their service provider. Today, we have adapted the concept of “trunking” to the IP-enabled landscape resulting in lower telephony costs and rapid return on investment (ROI) plus the opportunity for enhanced communications both within the enterprise and with vendors, customers and partners.
An SIP (Session Initiation Protocol) trunk is a service that allows businesses with an installed PBX to use real-time communications including VoIP. By connecting an SIP trunk to an internal traditional PSTN (public switched telephone network) phone system, companies can communicate over IP outside the enterprise. What’s more, companies can replace traditional fixed PSTN lines with an IP phone system connected externally through an SIP-trunking service, thereby creating a single conduit for multimedia components including voice, video and data. As a result, an SIP-trunking service typically delivers greater cost savings and increased reliability.
One of the immediate ways SIP trunks reduce communications costs is by eliminating the need to purchase ISDN, BRIs, PRIs or local PSTN gateways. Since the voice traffic is now routed through the Internet connection to the ITSP, no local connection to the PSTN is necessary at the enterprise location.
The gateways needed to connect to the PSTN will reside in the ITSP’s premises. The devices required at the enterprise edge for SIP trunking are not only typically cheaper per line than the equivalent PSTN gateway, but they also enable the whole breadth of SIP-based real-time communication and therefore become a strategic device in the future of enterprise communication OpenText RightFax supports SIP trunking to send and receive faxes using remote phone lines accessed via the Internet. Businesses need to minimize operations costs such as installing, configuring, and maintaining physical phone lines and PBX’s for each office. SIP trunking can move those wires and switches into the cloud. Companies that choose SIP trunking for fax and FoIP can deploy RightFax without in-house fax boards, fax gateways, or switched telephone network (PSTN) lines. Instead of a physical trunk of wires for PSTN lines, SIP trunking provides a virtual trunk over the Internet to PSTN lines. A session border controller (SBC) manages communications between RightFax and the phone equipment in the cloud. RightFax supports SBC’s from major vendors including Dialogic and Cisco.