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Permanent Virtual Circuits
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The Permanent Virtual Circuit initiates a permanent link between two subscribers of the Network. The Permanent Virtual Circuit replaces an end-to-end Leased line without the need for call set-up procedure. Very useful for Corporate Houses wishing to link two or more major offices.
It is like a HOTLINE linking the offices across the country.
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Reverse Charging
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In Reverse Charged calls, the call is billed on the CALLED subscriber. This enables Information Bureaus, Computing Bureaus etc. to exclude communication costs as a part of their services to the customers. i.e. the customer is able to access the service without having to pay for it.
It is akin to a TOLL FREE number for the CALLING subscriber.
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Closed User Group
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A group of users may form themselves into a CUG, creating a Pseudo "Private" sub-networking, utilizing the facilities of the network. This service enables the subscribers belonging to the same CUG to make communications with each other preventing access from or to the world outside the group.
An organization with CUG would be like a giant EPABX Exchange over the whole country.
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Fast
Select
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To send even one packet of data, a Data Terminal must exchange at least 3 packets to establish and later release the logical connection. This overhead is avoided by Fast Select facility, whereby the Terminal may send up to 128 octets of data in the CALL REQUEST/INCOMING CALL packet.
This is useful in applications like Credit Card Verification Systems leading to enormous savings in the communications cost.
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Charging Information Indication
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In applications like the Public Call Office (PCO), information about the Data transacted and the duration of the call are required to bill the call. Charging Information Indication displays this information at the end of each call. Even if this facility is not subscribed for, Charging information may still be obtained on a per-call by indicating the requirement in the facility field.
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