isdn...

BT (British Telecommunications) plc

We can either provide new BT ISDN, or take over your current BT ISDN2 or ISDN30 without moving them off the BT network. So if you think we can help, call us on 01983 217500

ISDN (Integrated Services over a Digital Network) allows you to integrate many types of communication services (for example, text, voice, data and video files), into a single network. We offer two variants of ISDN.

 – ISDN30e - One copper or fibre circuit consisting of up to thirty channels of ISDN, each operating at up to 64 Kbps speed.

 – ISDN2e - One copper circuit containing two channels of ISDN, each operating at up to 64 Kbps speed.

ISDN30e

ISDN30e is mainly used by medium to large size businesses with a telephone system (PABX) on their premises, who require their voice and data services to be received and delivered either singly or integrated together.

Each ISDN30e service is delivered as a 2 Mbits service. It is provided into your premises from your local BT telephone exchange over either a copper or fibre circuit or via a radio connection. It comprises of 30 independent 64 Kbps channels, plus two further channels - one for synchronisation and maintenance, the other for service signals. When newly provided, a minimum of eight 64 Kbps channels must be operational. Additional channels can be provided as and when required, either singly or in batches. When you reach the position of having 30 channels operative but need more, a new ISDN30e service can be delivered and linked, providing up to another 30 channels.

Using ISDN30e enables a wide range of applications to be run at any speed from 64 Kbps up to 2 Mbits, such as :-

File transfer between computers.
Internet Access.
Video conferencing.
Inter office remote network access.

ISDN30e circuits support DDI "Direct Dialling In" and many Select Services. Most of these, although only if you so choose, can be integrated via your telephone system into your computers' operating system to create a CTI "Computer, Telephony Integration" service for your company.

Herewith a listing of the ISDN30e Select Services that are currently available.

DDI - Direct Dialling In
DDI numbers allow you to increase the amount of telephone numbers you have available for people to call you. DDI numbers are provided either as single numbers (SNDDI's) or in blocks of ten. To give an example. Your main (switchboard) telephone number would be 020 900 9000 and your 7x 10 number DDI range would be telephone numbers 020 900 9001 to 020 900 9070. Using DDI allows you to allocate individual extensions their own inbound telephone numbers, so people can ring your employees directly, without going via your switchboard.

In the event that a DDI number that has been dialled is either engaged or not answered, the DDI can be set up to automatically route the call to the switchboard or to another extension. Alternatively, by utilising an ISDN Select Service, such as CCCF "Customer Controlled Call Forwarding" the unanswered call can be forwarded to another (fixed line or mobile) phone number, without the caller experiencing any delay.

PNCLI - Presentation Number Calling Line Identity
Presentation Number (PN) allows you to specify a telephone number for your Calling Line Identity (CLI) for outgoing calls, which may be different to your usual telephone number. For example, your company's branches could present your call centre's 0800 number to direct return calls to the call centre, rather than back to the branches, thus resulting in improved customer handling. PN is often used in conjunction with our "Non-Geographic-AREA CALL NUMBER" service.

CLIP - Calling line Identity Presentation
Shows the telephone number of the person calling you.

CLIR - Calling Line Identity Restriction 
Prevents others from seeing your telephone number when you call them.

CCCF - Customer Controlled Call Forwarding 
Enables you to transparently forward incoming calls to another telephone number, in the event that you are not available.

Call Deflection – Allows you to deflect calls of certain types, from certain numbers or calls to specific numbers or DDI extensions. A deflected call can be directed to any phone number that accepts incoming calls (such as a mobile phone or an ordinary exchange line).

Sub-Addressing – Send up to 20 Alpha numeric characters (except #) with the digits of the telephone number you are dialling. Sub-addressing is available for use on calls between ISDN 30e and any other European versions of ISDN (e.g. Business Highway). Sub-addressing is often used to allow connection to a specific piece of equipment (e.g. a fax machine or telephone) or a particular application on a computer.

Call Forwarding: Unconditional – A one-off request to BT to forward all your incoming calls to a designated number.

Call Forwarding: On Busy – A one-off request to BT to forward all your incoming calls to a designated number when your line is engaged.

Call Forwarding: On No Reply – A one-off request to BT to forward all your incoming calls to a designated number when your line is unanswered. 

ISDN2e

ISDN2e can be presented in either of the following formats. ISDN2e SYSTEM - For carrying voice calls. ISDN2e STANDARD - For carrying voice or data calls (often used for connecting to the Internet).

ISDN2e SYSTEM circuits are presented via a BT "NTE" diagnostic box onto your Telephone System. Each circuit contains two channels (often referred to as lines). You can have a maximum of sixteen ISDN circuits connected to your Telephone System per main ISDN2 bearer number.

ISDN2e SYSTEM circuits support DDI "Direct Dialling In" and many Select Services. Most of which, although only if you so choose, can be integrated via your telephone system into your computers' operating system to create a CTI "Computer, Telephony Integration" service for your company.

Herewith a listing of the ISDN2e SYSTEM Select Services that are currently available.

DDI (Direct Dialling In) – DDI numbers allow you to increase the amount of telephone numbers you have available for people to call you. DDI numbers are provided either as single numbers (SNDDI's) or in blocks of ten. To give an example. Your main (switchboard) telephone number would be 020 900 9000 and your 10 number DDI range would be telephone numbers 020 900 9001 to 020 900 9010. Using DDI allows you to allocate individual extensions their own inbound telephone numbers, so people can ring your employees directly, without going via your switchboard. In the event that a DDI number that has been dialled is either engaged or not answered, the DDI can be set up to automatically route the call to the switchboard or to another extension. Alternatively, by utilising an ISDN Select Service, such as CCCF "Customer Controlled Call Forwarding" the unanswered call can be forwarded to another phone number, without the caller experiencing any delay.

PNCLI - Presentation Number Calling Line Identity
Presentation Number (PN) allows you to specify a telephone number for your Calling Line Identity (CLI) for outgoing calls, which may be different to your usual telephone number. For example, your company's branches could present your call centre's 0800 number to direct return calls to the call centre, rather than back to the branches, thus resulting in improved customer handling. PN is often used in conjunction with our "Non-Geographic-AREA CALL NUMBER" service.

CLIP - Calling line Identity Presentation
Shows the telephone number of the person calling you.

CLIR - Calling Line Identity Restriction 
Prevents others from seeing your telephone number when you call them.

CCCF - Customer Controlled Call Forwarding 
Enables you to transparently forward incoming calls to another telephone number, in the event that you are not available.

Call Waiting & Call Hold – Allows you to have up to 4 voice or data calls waiting at any one time. Any one of the waiting calls can be selected for connection at any time. The Call Hold part of the service allows you to switch between individually held calls without losing them. The calls can be incoming or outgoing.

Call Deflection – Allows you to deflect calls of certain types, from certain numbers or calls to specific numbers or DDI extensions. A deflected call can be directed to any phone number that accepts incoming calls (such as a mobile phone or an ordinary exchange line).

Sub-Addressing – Send up to 20 Alpha numeric characters (except #) with the digits of the telephone number you are dialling. Sub-addressing is available for use on calls between ISDN 2e and any other European versions of ISDN (e.g.. Business Highway; ISDN 30e). Sub-addressing is often used to allow connection to a specific piece of equipment (e.g.. a fax machine or telephone) or a particular application on a computer.

Call Forwarding: Unconditional – A one-off request to BT to forward all your incoming calls to a designated number.

Call Forwarding: On Busy – A one-off request to BT to forward all your incoming calls to a designated number when your line is engaged.

Call Forwarding: On No Reply – A one-off request to BT to forward all your incoming calls to a designated number when your line is unanswered.

ISDN2e STANDARD - Can be used for calls but mainly used for transmitting data (typically video conferencing using ISDN6).

When provided exclusively for data purposes. The ISDN2e STANDARD circuits are presented onto an BT "NTE" diagnostic box with RJ45 connecting sockets. The two ISDN2e channels can be "dual bonded" together to transmit all kinds of information at a transfer rate of up to 128 Kbps, with no overhead bits lost and negligible bit loss, or data frame repetition because of the digital lines' high immunity to line noise.

When provided for carrying voice calls. The ISDN2e STANDARD circuits are presented via a BT "NTE" diagnostic box onto your Telephone System. Each circuit contains two channels (often referred to as lines). ISDN2e STANDARD is typically provided where there is one, stand-alone, ISDN2e line. Additional telephone numbers can be assigned to your ISDN2e STANDARD line using MSN "Multiple Subscriber Numbering"

MSN - Multiple Subscriber Numbering
MSN lets you have up to 10 directory numbers associated with your ISDN2e STANDARD line, enabling you to be able to assign different numbers for fax, telephone, data and video services. The call information that is sent down the ISDN2e STANDARD line and any extension wiring will be the last 6 digits of the called number only.

Herewith a listing of the ISDN2e STANDARD Select Services that are currently available.

PNCLI - Presentation Number Calling Line Identity
Presentation Number (PN) allows you to specify a telephone number for your Calling Line Identity (CLI) for outgoing calls, which may be different to your usual telephone number. For example, your company's branches could present your call centre's 0800 number to direct return calls to the call centre, rather than back to the branches, thus resulting in improved customer handling. PN is often used in conjunction with our "Non-Geographic-AREA CALL NUMBER" service.

CLIP - Calling line Identity Presentation
Shows the telephone number of the person calling you.

CLIR - Calling Line Identity Restriction 
Prevents others from seeing your telephone number when you call them.

CCCF - Customer Controlled Call Forwarding 
Enables you to transparently forward incoming calls to another telephone number, in the event that you are not available.

Call Waiting & Call Hold – Allows you to have up to 4 voice or data calls waiting at any one time. Any one of the waiting calls can be selected for connection at any time. The Call Hold part of the service allows you to switch between individually held calls without losing them. The calls can be incoming or outgoing.

Call Deflection – Allows you to deflect calls of certain types, from certain numbers or calls to specific numbers or DDI extensions. A deflected call can be directed to any phone number that accepts incoming calls (such as a mobile phone or an ordinary exchange line).

Sub-Addressing – Send up to 20 Alpha numeric characters (except #) with the digits of the telephone number you are dialling. Sub-addressing is available for use on calls between ISDN 2e and any other European versions of ISDN (e.g.. Business Highway; ISDN 30e). Sub-addressing is often used to allow connection to a specific piece of equipment (e.g.. a fax machine or telephone) or a particular application on a computer.

Call Forwarding: Unconditional – A one-off request to BT to forward all your incoming calls to a designated number.

Call Forwarding: On Busy – A one-off request to BT to forward all your incoming calls to a designated number when your line is engaged.

Call Forwarding: On No Reply – A one-off request to BT to forward all your incoming calls to a designated number when your line is unanswered.

01983 217500