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SIP trunking

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In telecommunications networks SIP Trunking is a VoIP solution based on SIP protocol [1]. This Solution allows ITSP (Internet Telephony Service Providers) to give Voice Services and unified communication via IP access to business customers (companies) equipped with a private infrastructure generally based on IP-PBX (Private Branch eXchange technology in IP).

Domains

The architecture of SIP Trunking provides a partition of the voice network in to two different domains of expertise [2] which consist of:

  • Private Domain: a VoIP solution realized at the customer's home that takes advantage of phone and unified communication services;
  • Public Domain: full VoIP access solution to the PSTN / PLMN property and responsibility of the ITSP that provides phone service. The interconnection between the two domains must occur through a SIP trunk.

The interconnection between the two domains, created by transport IP (Internet Protocol), involves setting specific rules and regulations as well as the ability to handle some services / protocols that fall into the well-defined name of SIP Trunking.

ITSP is completely responsible towards the authority regarding all the following law obligations of the Public Domain [3]:

  • Tracking traffic;
  • Identification identity of users;
  • Implementation of the lawful interception mechanisms.

The private domain instead, by nature, is not subject to particular constraints of law, and may be either the responsibility of the ITSP, the end user (enterprise) or of a third party who provides the voice services to the company.

Architecture

In each domain there are elements that perform the characteristic features requested to the that domain, in particular the result (as part of any front-end network to the customer) is logically divided into two levels:

  • The control of access (Class 5 softswitch);
  • Network-Border Elements [4][5] that allow to separate the Public Domain from the Private one implementing all the appropriated ITSP phone security policies.

The private domain consists of three levels:

  • Corporate-Border Element that allow to separate the Public Domain from the Private one implementing all the appropriated Company security policies.
  • Central Corporate Switching Node;
  • IP-PBXs.

See also

References

  1. ^ "SIP Trunking Global Online Community"
  2. ^ Ivan Gaboli, Virgilio Puglia, "SIP Trunking the route to the new VoIP services",IEEE, 06 January 2011, ISBN 978-1-4244-8272-6)] [1]
  3. ^ Legal issues in different countries
  4. ^ Role of Border Element
  5. ^ Session border controllers
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