Skillz to Use…How does SIP Trunking work?

SIP trunks has taken the telephony industry by storm. SIP trunks allows you to have a call flow that is versatile and cost effective for your organization. Unlike its TDM predecessor for PSTN calls, SIP trunks gives you the ability to expand based on your needs, not limited to 23 channels as with T1 circuits. Staktron offer 99.999% uptime with our SIP Trunks (StakSIP).

The architecture of SIP trunking provides a partitioning of the Unified Communications network into two different domains of expertise:

Private Domain: refers to a part of the network connected to your PBX or unified communications server (typically everything you are responsible for).
Public Domain: refers to the part of the network which allows access into the PSTN (Public Switched Telephone Network) or PLMN (Public Land Mobile Network). This is usually the responsibility of your internet telephone service provider (ITSP).

The interconnection between the two domains must occur through a SIP trunk.

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

The ITSP is completely responsible to the applicable regulatory authority regarding all the following law obligations of the Public Domain:

Tracking traffic;
Identification 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.

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