SIP for Business Travelers: Open Access Software

Session Initiation Protocol (SIP) is the technology through which VoIP communication is delivered. SIP can be used on an enterprise-grade level to provide international marketers and business travelers with a cost-efficient method of worldwide telecommunications access.

How SIP Works

SIP is delivered via a method called “trunking,” which eliminates the need for traditional phone lines by combining voice and data signals over a single IP circuit. SIP can be used both to initiate small-scale VoIP communications and host business-grade IP PBX phone systems.

Why SIP?

So why use SIP in lieu of the more traditional Public Switched Telephone Network (PSTN)? There are many advantages to initiating SIP communications. For business travelers, SIP can increase both telecommunications reliability and cost efficiency. The following are a few features of SIP calling that are gaining rapid popularity in the business world:

  • IP PBX: IP PBX, also known as hosted PBX, is a recently developed telephony system that enables the virtual management of business telecommunications. IP PBX systems reduce business overheads by eliminating the necessity of equipment installation and maintenance. These third-party call centers generally use a combination of SIP and traditional calling methods to guarantee communications connectivity. IP PBX systems are ideal for business travelers, reducing the cost of international telecommunications by up to 70% while ensuring connectivity to even the most remote of locations.
  • Voicemail and Fax Conversion: Business traveler communications are often limited by roaming charges and equipment inaccessibility. SIP technology enables automatic voicemail and fax email forwarding, allowing travelers whose mobile devices are incompatible with local networks to access voicemail and fax communications via any wifi hotspot.
  • Cheap International Calling: Because SIP calls are not routed traditionally,even businesses with high-volume international call traffic can utilize SIP circuits without incurring high toll and roaming charges. Business travelers can use toll-free SIP lines or free VoIP applications to communicate at low cost with employees, co workers and clients while on the road.
  • 24/7 International Connectivity: By routing calls through the internet, SIP technology enables business travelers to stay connected 24/7 without incurring any extra telephone usage charges. In addition to facilitating free business and conference calls while on the road, SIP makes tablet and computer calling possible, ensuring that travelers whose phones are not compatible with international call networks need not lose service.

SIP Technology

So how does SIP technology work to deliver all of these low-cost international calling features? SIP was developed in response to consumer demand for a cheap, scalable communications system whose functionality was not exclusively reliant upon fallible phone lines. The SIP process can be broken down into the following basic steps:

  • SIP users are assigned SIP addresses that serve to identify them on the SIP network
  • When a SIP user initiates a call, a SIP request is sent to the callee address
  • If the callee is available, a connection is established and a SIP session is begun
  • If the end point cannot be reached, or the request fails to connect, SIP returns a message to the caller indicating that a session could not be initiated
  • If a call is transferred mid-session, SIP redirects the call to a new endpoint
  • When the session is complete, SIP logs and terminates the call
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