Ayava CS1000


The Avaya CS1000 is part of the Nortel range that was upgraded to Avaya IP Office. It has been classified as end of sale by the manufacturer as of April 2018 and will no longer be supported by Avaya as of April 2019.

If you have an Avaya CS1000 system, please call us on 0844 993 4200 to discuss your support and upgrade options.


  • IP Office is quite flexible.
  • Provides upgrade from the Nortel BCM systems.
  • Supports digital, analogue and IP handsets.
  • Uses digital, analogue and IP trunks.
  • It is a hybrid platform.
  • It has built-in voicemail as well as the option for external enterprise voicemail, which is a bigger voicemail system.
  • It can go from 2 extensions right up to 500 on the same chassis.
  • It can also be networked and is easier to achieve a networked system than some of the other manufacturers.
  • Allows networked voicemail.
  • Fairly flexible and can be integrated with other systems.
  • Has call recording functionality via the voicemail system, so allows you to listen back to calls if needed.


  • To get comparable functionality on the
    voicemail, you need voicemail pro which is an external system.
  • Some of the functionality is a bit unusual from
    an engineering point of view so can require expert support.
  • You need a server to run this system, which is
    an extra cost.
  • Slightly pricier than some other comparable systems.

System Manual Downloads:

    Frequently Asked Questions


    An analogue phone is just for voice services. To do other things, you have to dial a number or press a recall key to get transferred. It uses a basic phone handset that requires the system to provide power.


    A digital phone can provide call information, extension status, information from other extensions and calls. This is displayed on the handset e.g. Caller ID etc. This also requires the system to provide power.


    An IP phone uses a data network to communicate with the phone system. It is more like an IT device, a laptop, or a smart TV. It requires structured cabling so doesn’t work over traditional 2 wire telephone cabling. An IP phone also requires a network switch to provide power to the phone itself.

    A soft phone is an application or a piece of software that is installed on your computer/phone/tablet that allows you to connect to a phone system over the mobile or data network. This is in place of a physical phone. You open the software/application and it displays a phone interface that you use as if it was a physical phone. 

    Software like Skype and WhatsApp are soft phone applications. It creates an audio or video connection. On software phones connected to phone systems, they also give the option to transfer to another extension, transfer to voicemail and other features. They work the same as a physical phone but with reduced functionality - as they don’t give you the same features but you can see who’s on the phone and listen to voicemail for example.

    Unified communications bring all the different ways that people communicate into one platform. They may have a physical phone on their desk, a mobile phone, emails and possibly social media.

    An example of this in action would be a call that comes in first to your desk phone, then to your desk phone and mobile, then it diverts to your voicemail which is then delivered to you as an email. That is then tracked by your CRM system. The unified communications system integrates with the other software.

    Computer Telephony Integration is a system or technology that allows a phone system and a computer to connect or integrate.

    These integrations allow advanced features to be used, for example caller information popping up on your screen (often known as call popping), advanced call transfer functionality, call routing, and call centre systems.

    Some larger or more advanced phone systems require a chassis which is like a rack or filing cabinet which contains 3 rows of slots.

    Each of those slots is the right size for a module to give you connectivity on the front to either connect your extensions or connect your lines or an application like voicemail.