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Reliable telephony software

Prosody S provides telephony resources for platforms such as contact centres, IP-PBXs, media servers, fax servers and conferencing products. With its extensive range of voice codecs and a cost-efficient per-channel pricing model, Prosody S is ideal for a wide range of communications applications.



  • Cost effective for any system size

    Licensed on a per channel basis.

    Comprehensive telephony resources

    Vast array of API commands; support for multiple voice and fax standards added over a decade of constant development.

    Suitable for a wide range of applications

    Contact centre, message broadcast, IVR, conferencing, unified communications, etc.


  • Bespoke APIs

    A customer application using Prosody S makes, receives and interacts with calls using the Aculab Call Control API, enabling telephony within business.

    Ready to deploy

    Prosody S is a fully featured product comprising high and low-level telephony resources, fax, conferencing and transcoding.

    Distributed architecture

    Licensed on a per channel basis and a distributed architecture allowing separation of application and media servers.

Prosody S features

trusted by...


  • What our customers say

    My Force testimonial
    “Aculab’s Prosody S solution has been a key enabler in our ability to deliver a fully virtualised software based version of our market leading DSX Integrated Communication Control Solution.”
    Dave Collins, Capita Communication and Control Solutions
  • What our customers say

    I-Tel testimonial
    “Trust in the stability of Aculab hardware products was already there and the success of implementing the Prosody S solution has only increased this confidence in Aculabs’ solutions.”
    Marc Herruer, CEO Phact
  • What our customers say

    Algar testimonial
    “ Aculab was very quick to understand our requirements and make the changes we need to get our development efforts underway. The ongoing support and consultation from Aculab was a tremendous asset.”
    David Orr, Paytel
  • What our customers say

    Algar testimonial
    “Prosody S represents a perfect match with our strategic choice to offer software only solutions based on standards like SIP as they have lower cost and are easy to install, maintain and operate.”
    Haakon Smeby, Managing Director, Loxysoft AS

Techical specification

    • Fully-featured product – low level and high level telephony resources, extensive fax features, conferencing and transcoding
    • Extensive portfolio of voice codecs – narrow band and wideband codecs available to suit a broad range of applications
    • Per-channel licensing model – means a lower cost of ownership and greater deployment flexibility
    • Scalable from 1 to 1000’s of channels per system –means applications can be expanded or scaled to suit any end-user channel count requirement
    • Can be deployed on any platform or form factor – you can choose the server best suited to your application, deployment environment, target market and price point
    • Distributed architecture – allows separation of application and media servers and provides the capability to create large multi-server systems
    • VM support – enabling deployments on virtualised server environments for hosted or cloud models
    • Channel count – from 1 to 1000s of channels per host CPU
    • Telephony resources – record, playback, fax, conferencing, CPA, IVR
    • Speech technologies – echo cancellation, barge-in to enable you to stop a replay, and silence suppression
    • Operating systems – runs on Windows or Linux, any platform/form factor (1U server, processor blade, general purpose PC)
    • Voice codecs – G.711, G.723.1, G.726, G.728, G.729A, G.729B, G.729AB, iLBC, GSM-FR, GSM-EFR, MS-GSM, AMR-NB, EVRC, SPEEX
    • HD voice codecs – G.722, G.722.1, G.722.2 (AMR-WB), Skype SiLK
    • Extensive fax support – including T.38 at up to V.34 speed and G.711 fax pass-through
    • Transcoding – any-to-any voice codec, full-duplex channels, rate matching, narrowband/wideband conversion (up/down sampling)
    • Media servers
    • Conferencing
    • Command and control solutions
    • Inbound/outbound IVR
    • Contact centres
    • PSAP CPE
    • Messaging
    • Voice broadcast
    • SIP trunking
    • Fax bureau/server
    • PBX
    • Soft phones
    • Online gaming platforms
    • Announcement servers
    • Transcoding platforms
    • Auto attendant
  • We support the full range of SIP protocols, for more information, please refer to the Signalling and Protocols portfolio.

    Signalling and protocol portfolio