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Types of Incoming Lines

SIP / VoIP Trunks - Per channel

For enterprises wanting to make full use of their installed IP-PBXs and not only communicate over IP within the enterprise, but also outside the enterprise a SIP trunk provided by an Internet Telephony Service Provider to connect to the traditional PSTN network is the solution. Unlike in traditional telephony, where bundles of physical wires were once delivered from the service provider to a business, a SIP trunk allows a company to replace these traditional fixed PSTN lines with PSTN connectivity via a SIP trunking service provider on the Internet.

A great reference to SIP Trunking can be found here: http://www.whichvoip.co.za/blogpage/what-sip-trunking-and-can-it-save-my...

ISDN Primary Rate Access (PRA) - 30 channels
Primary Rate Access (PRA) is used when thirty channels are required. The ISDN30 service is applicable and offers 30 B Channels of 64 kbps each and one 64 kbps D Channel, which is used for signalling.

The ISDN30 service offers integrated voice, data, video and image transmission, or any combination thereof, with vastly increased quality and data speeds due to digital transmission.

The service provides 30 independent B Channels of 64 kbps and one D Channel of 64 kbps. B Channels are used to carry virtually any kind of digital information. The B Channel calls are seen as normal, independent telephone calls to separate destinations. The D Channel will set up and control these B Channel calls.

Telkom ISDN30 usually terminates on medium to large PBXs with integrated ISDN support, Multiplexers or independent Primary Rate network terminators. An ISDN PBX will then provide Basic Rate Access extensions. When using Telkom ISDN30 for voice applications each Primary link from each PBX can support 30 simultaneous calls and these calls can be to 30 different locations.

By connecting Telkom ISDN30 to an ISDN multiplexer several types of equipment such as PBXs, Routers and Codecs can be connected to the multiplexer. The multiplexers will allow for n x 64 kbps bandwidth-on-demand applications such as video conferencing and LAN interconnection.

ISDN30 as classified under Primary Rate Access

The Primary Rate Access has a bandwidth of up to 2 mbps over balanced symmetrical pairs of copper cable or a coaxial cable, optic fiber cable, digital microwave or radio links (G.703 interface), 120 (impedance) and provides 30 independent logical B Channels of 64 kbps and one D Channel of 64 kbps (30B + D). PRA is used to interconnect PABXs with ISDN capabilities, routers or PRA network terminators with the digital exchange. An ISDN PABX will then either provide BRA or analogue extensions.

ISDN Basic Rate Access (BRA) - 4 channels
Basic Rate Access (BRA) is used when two channels are required, and consists of two products ISDN2 (used for digital equipment) and ISDN2a (used for digital and analogue equipment). BRA offers two 64 kbps channels (or 128 kbps when bonded) and one 16 kbps channel (known as the D Channel). The B Channel may be used for voice; data, video or image communications by the user and the D channel is used for signalling. The two B Channels that are available can be used simultaneously and independently, for example; you may use the Internet, receive a phone call, send or receive a fax - any two at the same time.

The ISDN BRA service (ISDN2 & ISDN2a) allows different information such as telephone calls, Internet access, video conferencing and faxes to be transmitted with digital technology that is more advanced than traditional analogue lines.

Two B Channels are available and can be used simultaneously and independently, for example; you may use the Internet, receive a phone call, send or receive a fax - any two at the same time. The speed of each B Channel is 64 kbps and may be bonded to provide the speed of 128 kbps.

Supplementary services provide additional functions to your existing ISDN2 BRA service. One such service is Multiple Subscriber Numbers, (MSN), and allows up to 4 additional telephone numbers.

A network terminator (NT) unit will be installed at your premises. Multiple devices may be simultaneously connected to the network terminator, including telephones, personal computers or fax machines

The only difference between ISDN2 and an ISDN2a service is the NT unit. A NT1 is installed for ISDN2 service and consist of two digital ports; therefore only digital equipment may be used (unless a Terminal Adaptor (TA) is purchased to allow connectivity to analogue equipment). For and ISDN2a service, a NT2 is installed and consist of two digital and two analogue ports (digital as well as analogue equipment will function on the ISDN 2a service).

Graphic illustration of a Typical Telkom ISDN2 Basic Rate Access

Graphic illustration of a Typical Telkom ISDN2a Basic Rate Access

ISDN2/2a as classified under Basic Rate Access

Basic Rate Access enables the user to transmit up to 128 kbps on a standard twisted copper pair. This bandwidth is divided into three logical channels, namely two independent B Channels of 64 kbps each and one signalling D Channel of 16 kbps. BRA can also be referred to as 2B + D. The B Channels are simultaneously available for voice, data, text or image calls, or any combination of these. These B Channel calls are seen as normal, independent telephone calls to separate destinations. The D Channel, on the other hand, will set up and control these B Channel calls. Therefore, a Basic Rate Access will allow up to two terminals to communicate simultaneously, using the two B Channels.

With only a digital line Terminating Card in the exchange and a Network Terminator (NT) on the customer's premises, Basic Rate Access of 128 kbps can be provided over the standard twisted copper pair used for standard telephone connections. This interface (twisted copper pair) is specified by ITU-T and is commonly referred to as the U bus.

On the customer's side of the NT, ITU-T has specified another interface, called the So bus. Customer Premises Equipment (CPE) may be connected to the S bus of an ISDN BRA. CPE can be categorised into two main functional groups namely ISDN S bus compatible CPE and non-compatible CPE. Compatible CPE is equipment which can be connected directly to the S bus, and which interfaces with the ISDN signalling protocol (e.g. ISDN PC-cards, ISDN digital telephone). Non-compatible CPE is equipment that cannot be connected to the S bus and which needs a mediation device to convert its protocol to an ISDN signalling protocol (e.g. V24, X25, analogue telephones and facsimile). This mediation device is called a Terminal Adapter (TA) and is applicable to ISDN2.

Basic Rate Access Network Terminator (NT)

A network terminator may consist of two functional components (NT1 and NT2). The NT1 has two digital ports for digital equipment. Should customers require analogue equipment to function a terminal adapter needs to be purchased.

The NT2a has two analogue and two digital ports, and both analogue and digital equipment can function. The network terminator form part of the ISDN basic rate access, and is supplied by Telkom.

Analogue Junction Line - Per channel

A copper single or multiple business lines, with standard voice capabilities, between your business premises and Telkom.

(TELKOM) Voice Line Alternative - Fixed Line Look Alike (FLLA)
Fixed Line Look Alike is a basic landline voice service provided over W-CDMA (wideband code division multiple access) using a fixed geographic number. This wireless technology is an alternative for areas with limited or no copper infrastructure.
You are allocated a normal Telkom number with 10 digits, starting with the three-digit area code, e.g. ('012' if you live in Pretoria and '011' in Johannesburg.), exactly the same as with all Telkom Business customers.  You also pay exactly the same call and rental rates as for Telkom Business Voice Services.

Please Note:
W-CDMA is not suitable for: Prepaid voice service, Hunting facilities and ISP dialup Internet.

Hunting Facilities - Per line

Number-Hunting enables you to add as many lines as you need in your business, yet advertise only one. As calls come in on your main number, Number-Hunting automatically finds the next free line and connects the call. The caller no longer has to wait until the main telephone line is free.

SmartAccess (080/0860/0861) - Linked to existing line service

SmartAccess provides a single number solution, enabling your business to be reached by dialing one telephone number, irrespective of the number or geographical locations of your business sites.

SmartAccess features a number of service options which make your business more accessible to your customers, enabling you to take advantage of new marketing opportunities.

FreeCall 080

Worldwide the FreeCall 080 service has been proven as the ideal way to attract new business. Any call made to a FreeCall 080 number is free of charge to the caller; regardless of its location in the country or where it is answered (this excludes calls from cellular phones and other operators). With FreeCall 080, you not only give your customers an added incentive to pick up the phone and call your number, but also show them that you really care by giving them free access to your service.

Note:If the FreeCall number is linked to another service provider, the SmartAccess rate to that provider will apply. (Ported numbers included).

ShareCall 0860

Callers pay the single on-net rate for Local and LD to the ShareCall 0860 number. The- Telkom on-net rate is 47c per minute during Standard Time and 23c during Callmore Time, with a minimum charge of 63c per call.

For calls made beyond the local call radius of 50km+ , the caller still pays the Telkom single on-net rate for Local and LD rate, while the called party will be liable for the ShareCall 0860 long-distance rate less the minimum charge, which is 63c, to a minimum of 0 cents per call.

Note: If the ShareCall number is linked to another service provider, the SmartAccess call rate to the service provider will apply, inclusive of the minimum charge. (Ported numbers included).

MaxiCall 0861

Under this option callers are liable for the full cost of the call, when the MaxiCall number is linked to a Telkom land line. Calls to MaxiCall 0861 numbers will be charged at a flat rate, with a minimum charge of 63c per call. The standard call rate for national calls extending beyond 50km applies i.e. 46c per minute during Standard Time and 23c per minute during Callmore Time.

Note: If the MaxiCall number is linked to another service provider, the SmartAccess call rate to the service provider will apply. (Ported numbers included) (see below for rates)

SmartAccess linked to other service providers

You may now link your SmartAccess FreeCall, ShareCall, MaxiCall number to other service providers. Only specific service providers are currently available.