Hybrid PBX:

A hybrid PBX has the IP Telephony gateways integrated in the TDM-PBX. This reduces capital and
operating costs of the standalone gateways. The primary advantage of a hybrid PBX is the enhanced
applications such as unified messaging and contact centers
Unified communications is the convergence of business and IP communications applications. It is this
convergence that allows IP communications to fundamentally transform existing business processes,
and maximize the business value of an investment of an IP network.
Effective communications is the most critical business process that impacts employee productivity organizational
efficiencies, and customer service. Lack of effective communications results in:
• Redundant communication sessions, where someone leaves multiple phone numbers and/or
duplicate voice and email messages;
• Unnecessary cell phone intrusions into client meetings, work sessions or personal time;
• Wasted time setting up conference calls, communicating call-in information, sending and receiving
documents and establishing separate sessions for voice and data collaboration;
• Difficulty quickly mobilizing key personal because each has a different set of communication
devices
and services.
These situations result in increased costs for redundant communication services, delayed responsiveness
to customers and business needs and failure to involve key people in discussions and decision
making.

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Hosted IP-PBX

A Hosted IP-PBX is a network-based IP-PBX. With this model, service provider have an efficient, profitable,
and cost-effective way to deliver comprehensive services to their customers
A hosted IP-PBX solution provides a customer with access to multimedia services that will improve corporate
information productivity and enhance communications by the deployment of real-time communications.
These services include:
• Number Portability
Number portability is the ability to use the same phone number for both the wired and
wireless clients.
• Multimedia Collaboration
With multimedia collaborations, employees can set up "virtual" meetings using voice or web
conferencing, share files with interactive collaboration, and take advantage of rich presence
and instant messaging capabilities.
• Unified Messaging
Users have a single multimedia mailbox that gives them access to voicemail, e-mail, faxes
from any wired or wireless client.

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Network IP Telephony

Service providers have traditionally transported voice and data traffic on separate, dedicated networks,
resulting in added costs and resource inefficiencies. With the expanded use of the Internet for voice and
video, service providers are shifting away from circuit to IP packet networks for transporting voice calls.
Service providers are approaching the implementation of IP Telephony (IPT) from a business case perspective
with the goal of decreased costs and increased revenues. Based on IP Telephony economics,
service providers have been implementing IPT in the following ways:
imagen
An IP multimedia subsystem allows service providers to migrate seamlessly to a converged voice and
data network architecture by integrating next-generation call control and existing class 5 switches. Service
providers are positioned to grow the network capacity incrementally without the over provisioning
typical of circuit switched network solutions.
With an IMS, a service provider is better able to control costs while maximizing its network and resources.
Instead of adding expensive circuits and trunks, the service provider adds trunking gateways
under the control of the IMS. The packet network is a lower cost infrastructure and it lays the foundation
for offering IP Enhanced services as required .

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Centrex IP

Service providers have providing digital Centrex to businesses for many years. Digital Centrex service
provides features that are similar to those provided by a premises-based PBX. Centrex IP Centrex leverages
systems enterprises currently have in place to reduce costs associated with buying, maintaining
and upgrading telecommunications equipment, protect against equipment obsolescence, and reduce the
time and expense of moving or adding phone services for a changing workforce. It unifies communications
that connect remote workers and locations, adding robust remote worker capabilities that help enterprises
increase worker productivity and improve customer service

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Internet Telephony Service Provider

An Internet Telephony Service Provider (ITSP) is a provider of IP-based local and long distance services.
ITSPs use the public Internet as transport network between subscribers. ITSP services can be
accessed using any broadband connection including DSL, Cable and Fixed Wireless Access (FWA).

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