ISDN / SIP
ISDN Basic Rate Access
Integrated Services Digital Network Basic Rate Access (ISDN BRA) allows service providers to offer data and voice services to smaller businesses (typically SME-sized) that require high speed data transmission and want integration of voice, fax and data traffic over one access line.
It provides two 64 kbit/s channels (B Channels) into end-users premises over the existing telephone line. ISDN BRA is ideal for high bandwidth applications and high speed calls where the average daily traffic on each channel is less than one hour.
Smartphone services can be incorporated with Basic Rate Access to increase end-user functionality.
Primary Rate ISDN
is most suitable for larger sites which require:
 Concentration of large volumes of voice calls (eg a Call Centre)
Concentration of large volumes of data traffic from remote users
A combination of the above.
Designed for large businesses' networking requirements. It can facilitate the large scale connection of voice and data circuits to a PBX (Private Branch Exchange), router, bridge or other ISDN compatible equipment.
Primary Rate ISDN provides up to 30 64kbps channels on a single access connection. Each channel can simultaneously and independently carry voice, data and video signals to and from different sites.
SIP Trunking
What is SIP Trunking?
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.
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SIP trunks can offer significant cost-savings for enterprises, eliminating the need for local PSTN gateways, costly ISDN BRIs (Basic Rate Interfaces) or PRIs (Primary Rate Interfaces).
There are three components necessary to successfully deploy SIP trunks: a PBX with a SIP-enabled trunk side, an enterprise edge device understanding SIP and an Internet telephony or SIP trunking service provider. |
The PBX
In most cases the PBX is an IP-based PBX, communicating with all endpoints over IP, but it may just as well be a traditional digital or analog PBX. The sole requirement is that an interface for SIP trunking connectivity is available.
The enterprise border element
The PBX on the LAN connects to the ITSP via the enterprise border element.The enterprise edge component can either be a firewall with complete support for SIP or an edge device connected to the firewall, handling the traversal of the SIP traffic.
The ITSP
On the Internet, the ITSP (Internet Telephone Service Provider) provides connectivity to the PSTN (Public Switched Telephone Network) for communication with mobile and fixed phones.
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