Are television commercials that run for one minute or for as long as a typical television program. Infomercials are also known as paid programming (or teleshopping in Europe). Originally, they were typically shown overnight (usually 2:00 a.m. to 6:00 a.m.) --- outside of peak hours. Some television stations chose to air such programming as an alternative to the former practice of sign-off. By 2008, most infomercial spending is during early morning, daytime, and evening hours. While the term "infomercial" is loosely used to refer to any direct response television advertisement (DRTV), in the US it is typically used to describe program length advertisements which are 28 minutes and 30 seconds in length. In the US, DRTV advertisements of :30 seconds to 2 minutes in length are typically called "short form" and not included in the advertising industry's use of the term "infomercial". Note that in the US market, a small amount of media can be purchased for 5 minute length advertisements however this time is quite limited.
(http://en.wikipedia.org/wiki/Infomercial )

'ISDN' is an acronym for 'Integrated Services Digital Network'.

Integrated Services Digital Network is a telephone system network. The key feature of the ISDN is that it integrates speech and data on the same lines, adding features that are not available in regular telephone systems.

There are several kinds of access interfaces to the ISDN defined:

Basic Rate Interface (BRI)
Primary Rate Interface (PRI)
Broadband-ISDN (B-ISDN)

ISDN is a circuit-switched telephone network system, that also provides access to packet switched networks, designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in better voice quality than an analog phone. It offers circuit-switched connections (for either voice or data), and packet-switched connections (for data), in increments of 64 kbit/s.

Another major market application is Internet access, where ISDN typically provides a maximum of 128 kbit/s in both upstream and downstream directions (which can be considered to be broadband speed, since it exceeds the narrowband speeds of standard analog 56k telephone lines). ISDN B-channels can be bonded to achieve a greater data rate, typically 3 or 4 BRIs (6 to 8 64 kbit/s channels) are bonded.

ISDN should not be mistaken for its use with a specific protocol, such as Q.931 whereby ISDN is employed as the network, data-link and physical layers in the context of the OSI model. In a broad sense ISDN can be considered a suite of digital services existing on layers 1, 2, and 3 of the OSI model. ISDN is designed to provide access to voice and data services simultaneously.

However, common use has reduced ISDN to be limited to Q.931 and related protocols, which are a set of protocols for establishing and breaking circuit switched connections, and for advanced call features for the user. They were introduced in 1986.[1]

In a videoconference, ISDN provides simultaneous voice, video, and text transmission between individual desktop videoconferencing systems and group (room) videoconferencing systems.

In telephony, interactive voice response, or IVR, is a phone technology that allows a computer to detect voice and touch tones using a normal phone call. The IVR system can respond with pre-recorded or dynamically generated audio to further direct callers on how to proceed. IVR systems can be used to control almost any function where the interface can be broken down into a series of simple menu choices. Once constructed IVR systems generally scale well to handle large call volumes.
(http://en.wikipedia.org/wiki/Ivr )