Reliability of SIP Trunking



A SIP Trunking is a service offered by an ITSP (Internet Telephony Service Provider) to use SIP, Session Initiation Protocol to set up communications between an enterprise PBX and the ITSP. SIP Trunking results in reduced telephony costs and rapid return on investment. It also provides opportunity for enhanced communications both within the enterprise and with vendors, customers and partners. By extending the SIP capabilities outside the LAN, satellite offices, remote workers and even customers can use VoIP and other forms of business communication applications to break down the geography barriers and to increase business productivity.

SIP Trunking replaces the need for bundles of physical wires with PSTN connectivity via SIP Trunking service provider on the Internet. Three components are necessary for the successful deployment of SIP Trunks- a PBX with a SIP enabled trunk side, an enterprise edge device understanding SIP, and a SIP Trunking service provider. SIP trunking delivers several benefits to a business:

  • Eliminates costly BRIs (Basic Rate Interfaces) and PRI (Primary Rate Interfaces) subscriptions.
  • Reduces cost by providing single connection for both voice and data connections.
  • Greatly increase flexibility and significantly reduces provisioning times.
  • Reduces the expense of purchasing, maintaining or supporting hardware media gateways.
  • Provides improved scalability to expand business communications while maintaining continuity.
  • Simplified management using an easy to use web based management system.

Reliability of SIP Trunking

The argument commonly heard about reliability of SIP Trunking is that, a connection using SIP Trunking is not as much reliable as that of traditional TDM. The TDM lines may have a slightly better average uptime in many parts of the world. But a TDM line, when down is truly dead, while alternative backup solutions are available with SIP Trunks.

A properly configured SIP Trunk line is more reliable than an ISDN. It’s important to provide an Internet access line with the capacity sufficient to support a SIP Trunk service. Using suitable encryption techniques guarantee the high security of calls that are protected against being intercepted. The major benefit with Internet is that it there is no single point of failure. Most SIP Trunking service providers have equipments placed in separate locations, so if one connection fails, the calls are automatically routed to an alternative location.

The migration towards a new technology will not happen overnight. So the enterprise might optionally choose to keep some traditional TDM/PSTN gateway capacity as a backup system. The right selection of features and service provider can provide a business with a highly reliable SIP Trunking than many TDM-based networks.  

          A business organization can trust SIP Trunking and its applications as long as they employ the right measures to secure media, future-proof the network with standards-based equipment, and are smart about the way SIP Trunks are deployed. Security, Quality of Service and interoperability issues can be reduced significantly by including a SIP capable edge device as a part of the deployment. It can provide excellent voice quality, easier deployment and an overall better experience. SIP Trunks pave the way for an all IP, all SIP world where employees can work equally without geographical constraints, and everyone is reachable anywhere anytime as long as there is an active Internet connection. 


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