Defining VoIP and IPT

The terms Voice over IP (VoIP) and IP Telephony (IPT) are often used interchangeably. There is an important difference however. VoIP is the art and science of placing voice in IP packets. IPT is VoIP plus signaling and features. Note this means that all IPT solutions are VoIP, but not all VoIP solutions are IPT.
The classic example of a VoIP application is replacing the tie lines between traditional PBXs with an IP backbone. The backbone network is simply being used to carry voice between the two PBXs. It is a form of trunking. Embedding voice in an application is often simply VoIP. For example, several e-learning platforms (e.g., CentraOne), make it possible for an instructor to speak in real time to the students in the virtual classroom. Students can also be given the chance to respond or ask questions, also within the application. This is a VoIP enabled application.
IPT is about doing what people do with telephones: it's about making calls. The telephones involved are IP-based phones. The signaling intelligence to determine who is calling whom is supported using IP-based protocols like the Session Initiation Protocol (SIP).
Cisco has further muddied the waters by introducing the more vacuous term IP Communications (IPC). In the Cisco world, this reflects a completely converged network that includes data, voice, and video.



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Premises-Based IPT Solution

The visual depicts a premises-based deployment of an IPT solution as it might be deployed by a company. The media gateway controller has a link to the PSTN to integrate SS7 information into the solution. The visual depicts a single IP PBX with an integrated media gateway. Additional PBXs, IP telephones, traditional phones, and softphones could exist at other offices as well. The carrier network backbone


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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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IP-PBX

IP-PBX
An IP-PBX replaces the traditional TDM-PBX and supports an evolutionary approach to IP Telephony.
The IP-PBX platform is based a client/server architecture which supports unified communications

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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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

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Premises-Based IP Telephony

Today, IP Telephony is utilized in small, medium and large enterprise networks. Organizations can
choose to implement IP Telephony in one of three ways:

IP-Enabled PBX:
An IP-Enabled PBX supports an evolutionary approach to IP Telephony. An IP Telephony gateway is
installed on either the trunk or line side of the traditional TDM-PBX. An IP-Enabled PBX supports both
access and desktop convergence.

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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

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.

Total Cost of Ownership (TCO)
Centrex IP reduces Total Cost of Ownership by:
1. Reduce Access Lines
Digital Centrex requires multiple digital lines installed from the provider to the business.
Centrex IP allows the replacement of these multiple digital lines with a single connection such as a
T1 or a managed broadband service.
2. Moves/Adds/Changes
One of primary advantages of Centrex IP is that moves, adds and changes can be managed by the
customer using a Centrex IP portal. A Centrex IP portal is a web based portal that allow an IT
manager do add or change phone feature sets.

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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:

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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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).

Internet Telephony Service Provider (ITSP) services:
• PC-to-PC
Internet telephony calls are made using a free downloadable client or browser-based softphone client.
The client is provided by the ITSP and both the called and calling party must use the same client.
Example: Skype Client
• PC-to-Phone (PSTN)
ITSPs offer a PC-to-Phone service at a reduced per minute rate. The calling party uses a softphone
client to connect or call a traditional circuit phone. The provider must install a gateway to connect the
IP network to the traditional circuit network. The function of the gateway is to packatize and compress
the analog voice to be transmitted over the Internet. The gateway receives IP packetized voice
transmissions from the calling party and converts them back to 64Kbps, the traditional circuit
switched format.
• Phone-to-Phone
ITSPs provide a premises-based gateway to the customer. The customer connects a standard analog
phone set to the gateway. The packets are transported using the public Internet to the termination
gateway which converts the IP packetized voice transmission back to the analog format

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Voice Over IP (VoIP).

Voice Over IP (VoIP) enables the convergence of traditional voice and data services by using an IP network
as the transport for both voice and data services. Service providers have been experimenting with
VoIP for the past five years, and now with a value proposition revolving around network infrastructure
cost savings, operational savings and new revenue opportunities, its appeal is growing. VoIP is poised
to be strategic to the overall business of both premises-based IT organizations and Managed Service
Providers (MSP).

Voice Over IP (VoIP) services:
1. Internet Telephony Services
Internet telephony refers to communications services such as voice, facsimile, and/or voice
messaging applications that are transported via the public Internet. Internet telephony is an
unmanaged service where no single provider on the Internet is responsible for end-to-end quality of
service.
2. IP Telephony Services
IP Telephony is a managed service with guarantees of service that can support full-duplex, real-time
voice communications. There are two types of IP Telephony services:
1. Premised-Based
A Hybrid PBX or an IP-PBX is installed on the premises replacing an existing TDM-PBX.
2. Network-Based
Centrex IP and Hosted IP-PBX are hosted services provided by a Managed Service

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