Digital Workshops are able to supply new and reconditioned telephone systems from Panasonic, British Telecom and Teldat Elmeg (formally Funkwerk Elmeg).

We are happy to take over support for telephone systems from most major manufactures on a pay-as-you-go basis.  We are happy to look at your current lease and maintenance agreements and advise you on what equipment you have, have much it is costing you and the way forward to reduce costs.

We are an independent company - we do not sell telephone lines or calls - so our advise is unbiased.  We have a proven track record of saving companies money on their telecoms by identifying mis-charging and replacing expensive leased equipment with the equivalent or better reconditioned systems when a lease is due for re-newal.

We can supply new and reconditioned equipment from full telephone systems, with up to 64 extensions, to expansion cards and additional hand sets for existing systems.

Many of our existing clients use us to support both their computer systems, their Internet connections and their telephone systems - this simplifies their support needs.

Please contact us by email or on (01323) 525 915 with any telecoms requirements or enquires.

The current prices for Teldat Elmeg telephone systems can be found here.

Fixed line and Voice over IP (VoIP)

Fixed line telephone systems use analogue or ISDN lines supplied by a telecoms provider to make and receive calls.  The maximum number of active calls is fixed by the number of lines attached to the system.  ISDN2 lines allow two simultaneous calls, while ISDN30 lines carry 8 - 30 calls, depending on the number of channels purchased.  An analogue line carries only one call.

Both ISDN and analogue lines can be combined to provide multiple lines on a single number.  Further, ISDN lines can support more then pne number to provide, for example, direct dial in numbers to extensions in addition to  the main company number.  However, you cannot have more then one line for an analogue line that has been activated for broadband or fibre Internet connection (although you can have it as one of the lines in your telephone switch, with a unique number).

Digital Workshops can advise you on the best combination of telephones lines for your company and manage ordering and installation of  fixed line telephone lines.

Voice over IP can be used to make calls via your Internet connection.  At some point, the VoIP call must break out from the Internet onto the normal public telephone line, either to receive calls from a non-VoIP caller or to call a non-VoIP destination number.  You therefore need a supplier who will do this for you - Digital Workshops can work with you to select the best VoIP provider for your company.

A telephone system use SIP trunks to carry VoIP calls between you and your telecoms provider. You can think of a SIP trunk as the equivalent of a telephone line.  The advantage of SIP trunks is that they can be added or removed from the system easily - to add a SIP trunk does not need a telecoms engineer to come in and install a telephone line. 

VoIP/SIP truck suppliers will provide you with a telephone number for incoming VoIP calls.  You can also make VoIP to VoIP calls, if the party you are calling also has VoIP.

To support SIP trunks your telephone system, you will need a SIP trunk card.  Many modern telephone systems already have these built in.  Most telephone systems will support a combination of fixed lines and SIP trunks - if you loose your Internet connection, and do not have fixed lines then you loose your ability to make and receive calls.

An extension of VoIP is to do away with the telephone system all together and use an Internet based virtual switchboard.  You use a IP telephone that supports SIP as an extension on a virtual Internet based telecoms provider via your Internet connection.  You can have as many extensions as you require - in this case you pay a monthly per seat fee for each extension.  The virtual switchboard will support all the facilities you want, such as voice mail, call forwarding etc.

The disadvantage of using a VoIP provider against a fixed line provider is usually the cost of the calls for outgoing calls.  Instead, a mixture of the two is best - fixed line for outgoing and SIP trucks for incoming.

VoIP in the office and for out-workers

VoIP telephones and soft telephones (computer program SIP telephones) can be used as replacements for traditional  telephones handsets.  These devices can share the computer cabling instead of requiring a separate connection to a telephone switch.

Out workers can also use VoIP telephones as extensions off the telephone switch, connected to the switch over the Internet.  In this case, a site-to-site VPN can be employed to encrypt and protect telephone link.

The telephone switch requires one SIP 'socket' for each attached telephone (just like it needs one extension port per traditional telephone extension).

(c) The Digital Workshops Partnership Ltd


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