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pabx systems


IT Care Telephony Solutions

IT Care offers a wide range of office communication system from conventional analogue  and hybrid compatible models to digital and full IP system models. IT Care is premium partners for a  complete range of telephony products and solution of various reputed brands from which you can easily select the model that best matches the usage and special needs of your office.

Please see the different scenerios applicable for commercial and business customers 

Scenario 1: Long-distance least-cost routing

This scenario is likely to be adopted by enterprises with high-cost call volumes.

A company with head-quarters offices and multiple-branch office sitesmakes daily long-distance calls to contact customers located all over the world. Since many telephone carriers provide cheap telephone rates depending on geographic areas, the competitive telephone market may be used to reduce communication costs.

Therefore, an engineering process is needed to keep the costs low. Least-cost routing is the solution to these kinds of problems, because it allows the telephone system to automatically route the long-distance call to the most economical telephony carrier/network, saving money on the long-distance bill and reducing the employee's effort in making calls. In order to put such solution in place, the company needs to deploy a set of gateways in the locations where branch offices are located, to take advantage of the integration of data and telephony links between locations.This can result in savings from both calls located in the area of the branch offices, as well as office-to-office calls, taking advantage of the data network connecting the company's sites. Note that in this case, a distributed routing table has to be implemented, in order to facilitate control by the system administrator, who may wish to update it anytime changes in long-distance rates occur.


Scenario 2: Integration of VoIP with legacy PBX systems

This scenario allows the co-existence and intercommunication of the institutional conventional telephony network (conventional phones connected to PBX) and the local IP Telephony network.The scenario is suitable when the local IP Telephony network is constructed gradually in an institution that already has a conventional telephony network. In a later stage, the conventional telephony network and the PBX can be totally replaced by the IP Telephony network

 For example, in order to provide for smooth transition, it might be worthwhile to buy a gateway with two ISDN PRI interfaces. One interface is connected to the PSTN and the second one to the PBX. During the transition period, a gateway also performs call routing between the PSTN and the old PBX and vice versa, providing a smooth transition.  Integration of IP Telephony with a legacy PBX system The choice of a particular interface between a PBX and a VoGW depends on the required functionality, availability of interconnection ports on both sides and also on cost constraints. Interfaces can be divided into analogue and digital.The former include a 2-wire U-interface with a subscriber loop and various types of E&M interfaces.The latter include an E1/CAS trunk with MFC-R2 signalling and ISDN with DSS1 or QSIG signalling.


Scenario 3: full replacement of legacy PBX systems with IP systems and unified communication.

 It is only in greenfield situations, when building a telephony service from scratch, or when an existing PBX is fully depreciated, that IP Telephony can be considered as a complete replacement alternative to a traditional PBX.


The Design

The design of an IPBX system involves a couple of choices.Intelligent vs. simple terminals IPBXs can support terminals in two ways: either through analogue ports that support analogue terminals, or through IP only.The latter implies that the terminals are intelligent devices, including an implementation of signalling functions. Since intelligence in IP phones is built-in anyway, these terminals are often equipped with interactive screens and other sophisticated functions.As a result, the equipment is expensive and requires the provision of power, either externally or by Power-over-Ethernet.