ISDN E1/T1 for AskoziaPBX

Superior call quality and reliability for your business

If your are looking for the highest possible call quality in combination with a high call load, ISDN PRI (T1/E1) might be the right choice for your business. PRI is more reliable compared to VoIP because SLAs with your telephone provider mandate a quick response to fixing any issues. Whereas your DSL or VoIP provider can go down for days without you being able to do anything about it. On the other hand, costs for ISDN PRI are higher compared to pure VoIP telephony. With Askozia phone systems you don’t have to decide for one technology as all our PBXs are hybrid systems. They allow you to connect to the traditional phone network via ISDN PRI and use IP communication via the internet at the same time to reduce costs.

  • Call quality

    ISDN provides a consistent call quality with a MOS value of 4.3, whereas the quality of a VoIP connection depends on many different factors (e.g. bandwidth+usage of your internet connection) and can not be predicted. The MOS scale is 1 (bad quality) to 5 (best quality).

  • Reliability

    PRI is also more reliable because SLAs with your telephone provider mandate a quick response to fixing any issues. Whereas DSL or IP provider usually don\’t guarantee any response times.

  • Costs

    It is a rule of thumb that ISDN is usually more costly than VoIP. However, prices depend on your location and the options available.

  • ISDN PRI (T1/E1)
  • consistent
  • high
  • usually higher compared to VoIP
  • VoIP (SIP trunking)
  • consistent
  • varying
  • unpredictable

Bottom line is, if your phone connection is mission critical and your business depends on it, T1 should be at least your fall back if something happens to your VoIP connection.

The optionally available PRI software module allows the seamless integration of E1/T1 ISDN interface cards and gateways with AskoziaPBX.

Next: PRI Software Module


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PRI software addon for Askozia PBX

Autoconfiguration of Openvox and Allo E1/T1 interface cards

The PRI software module for AskoziaPBX allows Plug&Play installation of beroNet, Allo and OpenVox PRI cards and gateways. You don’t have to install additional drivers or any other software. Just plug the card into your system and boot AskoziaPBX. The card is recognized and all you have to do is to match your DIDs with your phones, call flows and applications. beroNet gatways can also be auto-configured via the web interface of AskoziaPBX.

AskoziaPBX supports the E1/T1 interface cards and gateways of

Next: What Do I Need to Use PRI?


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What do I need to use PRI?

E1/T1 at a glace

In addition to a PRI line from your telephony provider you either need AskoziaPBX software license with PRI module and supported PRI hardware or one of our ready to use phone systems with PRI from our online shop.

ISDN is divided into two types of services, BRI (Basic Rate Interface) and PRI (Primary Rate Interface). BRI is mostly used by smaller enterprises, PRI is meant for medium and large enterprises as well as smaller companies who require a high number of parallel calls. Both, BRI and PRI are consisting of B and D channels. B-channels carry voice, D-channels carry control and signaling information. BRI consists of two B-channels and one D-channel. PRI is often referred to as T1 (North America and Japan) and E1 (Europe and Australia). T1 usually has 23 B-channels and one D-channel, E1 usually 30 B-channels and 2 D-channels.

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