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What Is Enterprise SIP (ESIP)?
What Exactly Is SIP?

By Dr. Steven Shepard, Ph.D
December 6, 2011

Like SS7, SIP is a signaling protocol designed to set up communication sessions in a network, but this time, in an IP network. These sessions include everything from a simple phone call to a multi-location, multimedia conference.

Because SIP was designed to support a wide array of service types, new and innovative capabilities become possible such as Web page click-to-call, Instant Messaging with incorporated buddy list access, and IP PBX support.

SIP is a simple, command-response protocol that is operationally similar to the protocol that governs the functionality of the Web: HTTP. When SIP is deployed
in the network, telephony becomes a Web application. It integrates seamlessly with other Internet services, and the convergence of voice and data including video, audio and image transfer becomes real.

SIP has become the basis for the next-generation network. It undoubtedly will be deployed by all service providers, from traditional wireline players, to mobile providers, to cable companies offering VoIP, to ISPs.

SIP facilitates the delivery of everything from traditional voice services to a host of capabilities such as convergence, IMS, femtocell deployment, online gaming,
voice and video conferencing, among many others. And SIP is an internationally recognized standard (a subset of the IP protocol suite), meaning that interoperability is a non-issue.


The flexibility and richness of IP is combined with the highly customizable nature of the PBX, creating the IP-PBX. The result is extraordinary.

Now we have technology emerging with the power to redefine the way businesses communicate. The flexibility and richness of IP, the power and control of the PBX, and the breadth that SIP brings to the table shine a bright light for Enterprise businesses. Enterprise SIP is the optimal result.


Network gurus for multi-location businesses know the process of interconnecting the branches to facilitate effective site-to-site communications is complicated, expensive and time-consuming.

In many cases companies rely on several service providers to provide full connectivity across their entire enterprise geography. As service demands change, when more bandwidth is required to a particular site, for example – the modifications required to make that happen can be costly in terms of both money and time. To further complicate matters, many multi-location businesses have grown through acquisitions and mergers, resulting in an inherited mix of on-premise equipment types and local services. This collage of premise configurations makes seamless site to site communications and a unified customer experience next to impossible.


Enterprise SIP is a powerful new solution designed for multi-location businesses that enables the business to serve its distributed branches with telephone service through one or a handful of centralized PBXs. It can provide centralized trunking and eliminate the need for PRIs or business lines at each location.

Enterprise SIP also enables the business to carry all voice and data over its private Wide Area Network (WAN), resulting in more efficient use of the network. It does all of this with built-in load-sharing capabilities to provide bandwidth where and when it’s needed to fully satisfy demand. Some SIP for the Enterprise services also provide bursting capabilities to accommodate seasonal demands or catastrophic
network events.

Before Enterprise SIP, it has been common for a multi-location business to have a telecom infrastructure.

Because of the company’s many locations, it was often necessary to engage multiple service providers to ensure connectivity between each location’s PBX and the Public
Switched Telephone Network (PSTN). In most cases, these connections were either ISDN PRI connections or IP trunks.


Instead of connections to each branch and through multiple carriers, it is now possible to provide an increased level of connectivity, with added redundancy –by consolidating those connections through a small number of locations and with a single carrier, while saving costs and streamlining telecom operations.


Not only does Enterprise SIP eliminate the need to buy and manage lines for each and every location, it also streamlines the operation of the telecommunications
infrastructure using a centralized PBX, rather than managing multiple, disparate systems at the premise.


• Lower operating costs through centralizing communications facilities
• Reduce location equipment needs and connectivity requirements
• Enable flexible redundancy
• Allow bursting: capacity can be shared seamlessly and fluidly across the entire enterprise when needed
• Use existing WAN for voice communications, resulting in more dynamic and efficient network resource utilization.


A primary and most important benefit that comes from Enterprise SIP is the degree of control that a customer enjoys, and the flexibility that it makes possible.

1. Consolidating voice and data over a single, converged IP network greatly reduces the cost and complexity of administration and management. Fundamentally, costs are reduced as the capacity required for voice and data
sessions is shared across the entire network.
2. Centralizing the PBX equipment in one or a few sites results in capital savings, greater control over site to site calling, and a unified customer experience. The
headache of trying to control communications across a myriad of premise configurations is gone, leaving only a router and phones at the premise.
3. Enterprise SIP allows for the consolidation of local and long distance inbound and outbound calling across the entire enterprise, regardless of the calling and called parties’ physical locations.
4. Enterprise SIP makes bandwidth management easy. By allowing for instantaneously available bandwidth on a demand basis, inbound and outbound calls always have adequate resources available to them.
5. And finally, Enterprise SIP allows for traffic prioritization: Voice can always be assigned the highest priority among the various traffic types using the connection, thus guaranteeing assured quality-of-service (QoS).

Of course these provide just a taste of benefits apparent to a business with Enterprise SIP.