Telephone Lines

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From a simple analogue line that you would have at home, through traditional Integrated Services Digital Network (ISDN) to a complex session initiation protocol (SIP) solution that incorporates resilience and disaster recovery, Working Technologies Limited can assist and walk you through this connectivity confusion.

With all options available we will review what suits your business requirements and ensure you understand the benefits of all solutions, including potential cost savings for migrating to the newer technologies of Voice over the Internet (VoIP). Analogue lines sometimes refereed as (Public Switched Telephone Network) PSTN are the basic lines that you would have at home, and in small business. They are also utilised for Red Care for burglar alarms, also asymmetrical data subscriber line (ADSL) often referred to as Broadband ISDN comes in two variants, ISDN2e often referred as Basic Rate Interface (BRI) and ISDN30 or Primary Rate Interface (PRI). Basically they offer the same in technologies but a difference in quantities of calls. An ISDN2e circuits has two channels that can be used for calls. ISDN30 starts at eight and can expand up to thirty channels. Each channel can carry up to 64k of data if required although this fairly uncommon to used ISDN for data.

An ISDN circuit can have such features as Direct Dial Inward (DDI). You can have a DDI for each user or extension on the system but wouldn’t need a physical channel for each of these numbers. The incoming DDI would choose whichever channel was free at the time. This allows scenarios such as 100 numbers but only require configuring 8 channels for the incoming calls to route the calls into the system saving money but giving efficiency in the usage of the channels.

SIP or Session Initiation Protocol is also knows as Voice over the Internet or VoIP.

SIP trunks connect over the internet so you do not need other types of phone lines such as ISDN but you do require a good Internet connection, with voice prioritisation and Quality of Service (QoS) to ensure that you your voice calls are prioritised over other Internet traffic. Not all systems are directly compatible but interfaces can be utilised for connectivity that converts the VoIP SIP protocol to the more traditional ISDN or even analogue that would connect to an older telephone system. Careful consideration should be taken before this decision to ensure a good service.

SIP allows multi-site, resiliency and disaster recovery options to be built in to your network, for full details please talk to Working Technologies.

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