Callisto Voice Recording

Voice recording anywhere

Callisto VoiceRecording for Cisco UCC solutions: Simple – reliable – secure!

Voice Recording made easy – for every need

Callisto VoiceRecording is suitable for any enterprise that wants a flexible, easy-to-use, reliable, cost-effective, and centralized voice recording solution for their cloud or hosted Cisco telephony infrastructure. The versatility ranges from call recording to meet legal requirements to recording for training purposes and essential call tracking while ensuring privacy and security.

Callisto VoiceRecording

Simple – reliable – secure!

  • Overview
  • Features
  • Services
  • References

On demand recording

In the ad hoc mode, Recording can easily be triggered during a call by pressing a button on a terminal or client. The Keep-It function records the entire call, even if a recording was started later.

Permanent recording

Any device can be permanently recorded with Callisto VoiceRecording. In addition to that, permanent recording allows calls to be marked as fully recorded even after a call (Keep-It function).

For all phones

Callisto VoiceRecording works on all phones. DECT phone calls can be recorded with the additional module RecordingBridge.

Secure recording and archiving

Calls can be recorded in encrypted, including end-to-end encrypted, form and checked for tampering using an authenticity check. Access to call recordings can be defined according to the 4-eyes principle. The recorded calls and data are stored locally and/or automatically transferred to an external ftp server and archived.

Simple and reliable

The configuration and use of Callisto VoiceRecording follow the consistent Callisto principles of simplicity and reliability.

All features in detail

Features from A–Z Description
Archiving The maximum storage size on Callisto for voice recordings can be defined. If the limit is exceeded, the oldest recordings are swapped out to the defined archive server. Recordings can be encrypted internally and externally. 240 KB per minute for high quality, 120 KB per minute for medium quality can be set.
Deployment The VoiceRecording module is an integrated part of the Callisto platform and can be easily activated with a license. Delivered as an appliance image (OVA), the Callisto system can be installed on any virtual machine or physical server.
External Storage Yes, with encryption and indexing for security and large scalability
Gadgets Gadgets available to control voice recording and “Search & Play”, for Jabber, Webex, Smartphones, Desktop and COC.
High Availability Yes
Mobile Enterprise recording External mobile phones recording using network-based recording.
Multi cluster support Yes, with non-overlapping dialing plan and same UC System version across the clusters.
Overlapping dialing plan support Yes, phones with overlapping numbers and shared lines can record calls and having them associated to the respective user.
Protocols and codecs SIP, SIPS, G711, G729
Provisioning Manual or automatic from Cisco UCM via AXL or CSV files. Web services (REST) supported.
Recording Annonuncement With Callisto Module “External Call Control” a corresponding announcement can be played.
Recording methods Cisco Phone (Built-in-Bridge) or Gateway (Network Based Rec)
Recording scope Incoming, outgoing, internal and external calls with appropriate filters. Recordings for caller and called party separately in L/R channel.
Report Overview of all recordings with details and search function for authorized users. If required, with 4-eyes principle.
Scalability Up to 480 parallel recordings on one Callisto appliance. Additional instances supported. Unlimited VoiceRecording users.
Search & Play Integrated web interface, plus Callisto Gadget VoiceRecording
Secure protocols and codecs Secure SIP (SIPs) and secure RTP (sRTP) with auto negotiation
Tamper-proof recordings By using a hash key algorithm, the voice recordings are completely forgery-proof.
User experience Permanent recording without user intervention. On-demand recording, can be activated via softkey. Possibility to pause recording for sensitive data acquisition. Keep-It recording, can be activated via softkey to save the entire call of a current call or the last call made. Call recording is also available through Callisto’s COC attendant solution or using Callisto Gadget with start/stop buttons. Compliant with GDPR regulation.

We Support You in Every Situation

Sales Support

We support you in every step of the resale cycle. Depending on your Partner level, we will guide you through the sales process with your customer.

Installation and Configuration Support

We support you during the installation, configuration, and roll-out process for on-prem, managed service, or cloud projects. A satisfied partner and customer is our daily goal.

Operation and Maintenance Support

We pay attention to the highest quality and stability in each phase of our product development process. Our dedicated support team is immediately available according to defined SLA times if any incident still occurs. More…


We train and support our partners and their customers to learn how to correctly install, manage and use our Callisto products. More…

Tailored Developments

Thanks to the unique Callisto “Open Applications Management” concept, partners and their customers can add customized and tailored applications to the system anytime during runtime with no service interruption. More…


Our long-lasting expertise in UCC services and comprehensive industry know-how lead CTModule to deliver the best-in-class consultancy for your projects. More…

You Can Expect Only the Best – Because Quality Matters


The Callisto appliance solution has been successfully tested and certified with Cisco UCM V12.5. In addition to that, the Callisto platform is compatible with all popular Cisco PBX systems (UCM, UCME, BE6k/7k, HCS, Webex).

Preferred Solution Partner

CTModule has been working with Cisco Systems since 2004 and is now one of the selected manufacturers worldwide with the Cisco Preferred Solution Partner status.

Swiss Made Software

Since 2007, the “swiss made software” label stands for Swiss values such as quality, reliability and precision - especially in software development. CTModule is one of the first members of this quality label.

Callisto Voice Recording – Your best choice


With Callisto VoiceRecording, you cover all possible customer scenarios: on-demand, permanent, Keep-It recording, and recording of 3rd party devices like DECT, etc.


Callisto VoiceRecording is secure and compliant with MIFID II, GDPR, and PCI-DSS.


Both intuitive recording and secure listening of voice recordings from all end devices, as well as the simple, user-friendly configuration of the various scenarios, highlight the simplicity of Callisto VoiceRecording.

crossplatfrom crossdevice

Uniform across all devices

Use Callisto VoiceRecording intuitively and reliably wherever you are with the device you want:

  • Cisco phone
  • Cisco Jabber
  • Webex (as soon as Tabs are available)
  • Smartphone
  • Callisto Operator Solution
  • 3rd-Party Systems like DECT (with the RecordingBridge module)


Possible recording scenarios

The flexibility of Callisto is reflected in the variety of possible applications with Callisto VoiceRecording:

  • Permanent recording: often used for important extensions such as emergency numbers, operator or interview recordings in the media sector
  • On-demand recording: for GDPR compliant recording. The start and the stop button can be pressed on your own device.
  • Recording with pause: for PCI-DSS compliant recording. During a recording, the Pause button can be pressed, e.g., to record a customer’s confidential credit card data, and then the recording is resumed by pressing the Resume Recording button.
  • Keep-It recording: what if, during a threatening call, you forget to start the recording? No problem: with the Keep-It function (in connection with permanent recording), the recording can still be recorded or saved during the call or after the call.

Furthermore, Callisto VoiceRecording supports all recording methods used in a Cisco environment such as:

  • Cisco Built-in Bridge (BiB) recording
  • Callisto Recording-Bridge (RecordingBridge module)
  • Network-based recording (Cisco Voice Gateway Forking)

Save playback of the recordings

The recordings can be viewed at any time through

  • web interface
  • Jabber tabs
  • Webex tabs (if available in Webex)
  • Callisto Gadgets
  • Callisto operator solution COC

securely and according to the 4-eyes principle. The permissions for the corresponding users are configurable. Monitor filters make it easier for interceptors to access the data quickly and securely.

Safe as a Swiss bank

End-to-end encrypted recordings are securely encrypted and stored in Callisto’s internal database or on any server according to specific criteria. Using the hash function, each recording is provided with a one-to-one watermark; subsequent editing of the same is therefore impossible and is immediately displayed by Callisto.

Whether the recordings are stored in Callisto itself or archived on a separate server, the encrypted data is transparent to Callisto in both cases.

Access to the data is restricted to authorized people only and can be configured accordingly via the Callisto user authorization – including the 4-eyes principle if wished by the customer.

Fast and secure access

With the help of monitor filters and authorizations, access to the sensitive data of the voice recordings can be quickly tailored to the needs of each individual user. The authorized users can then easily and quickly access the data through the various end devices and clients to…

  • access the records,
  • filter them further,
  • search for different criteria of the recording,
  • play them back,
  • store them permanently if necessary, and
  • check in detail the information about the recording, including its authenticity.

The voice recordings are recorded by Callisto in stereo so that the caller can be listened to separately with the right audio channel or the called party with the left audio channel (L = local, R = remote).



Callisto VoiceRecording meets the guidelines

Your obligations for voice recording regulations are:

  • documentation obligation or legally compliant management of records
  • notification to customers about the recording and archiving of communications
  • ability to provide information about records
  • compliance with transparent processes related to records
  • obligation to retain records for a certain period of time and deletion after a defined time or upon request

and our incentive is to provide the Callisto voice recording solution compliant with these guidelines. That is why Callisto VoiceRecording supports:

  • an evidentiary record
  • information of callers before recordings
  • efficient search & playback of recordings
  • conform access rights to data for council regulations
  • secure encryption and archiving of recordings
  • a fail-safe system architecture

You can use the module VoiceRecording for all GDPR, MIFID II- or PCI-DSS-compliant projects.

Technology that inspires

  • Architecture
  • Requirements
  • Compatibility

Callisto architecture – The new simplicity

The Callisto platform provides the following features (without Modules and Applications):

  • all interfaces to the Cisco telephony infrastructure, provisioning (e.g., Kurmi), and 3rd party systems (e.g. (S)PMS, CRM, alarm systems, etc.)
  • Base infrastructure for import, configuration, and administration of modules, collections, and applications
  • Platform management for security, back-up/restore, update/upgrade process, licensing, log and troubleshooting capabilities
  • Dashboard and reporting
  • Single Sign-On (SSO) support
  • User and administrator management, rights management.

After licensing, modules, collections, or customized applications can be uploaded to the Callisto platform and configured in a simple and flexible way.
Callisto, with its available modules and applications, supports the following end devices and clients (depending on the use case):

  • Callisto web and telephone interface
  • Cisco endpoints (XML-enabled with push message support)
  • Cisco Jabber client with Callisto Gadgets (tabs)
  • Cisco Webex App
  • PC with Callisto operator solution and Callisto Gadgets
  • SmartPhones (iOS/Android) with Callisto Gadgets and native applications
  • Tablets (iOS/Android) with Callisto Gadgets and native applications
  • Legacy phones, DECT phones, WLAN phones according to manuals.

The Cisco PBX infrastructure (BExk, UCM, HCS) is connected to the Callisto platform via SIP trunk, AXL, and JTAPI (for COC switch solution) or SFTP (for CDRs).
Further Callisto interfaces are:

  • SIP, Secure SIP (UDP, TCP, TLS)
  • RTP, SRTP, T.38/G.711 (Softfax)
  • Cisco AXL
  • IP Socket connection
  • HTTP(S), (S)FTP
  • (S)LDAP (authentication, phone book)
  • ESPA 4.4.4 / X (Alarming)
  • REST (provisioning)
  • Application interfaces for various services or applications

The Unified Presence Server (CUPS) can be integrated as an external presence source.

Minimal requirements and resource-saving for green IT

The following requirements are needed for a proper use of the Callisto platform with the selected module(s):

Requirements Requisite/Description
Callisto Appliance (virtual Image, OVA)
  • One Callisto appliance for up to approx. 1000 parallel calls on the platform.
  • One platform is sufficient for an unlimited number of users and voicemail boxes
Virtual environment minimal: VMware ESX(i) 6.5
Callisto Appliance “Small”
  • up to 60 parallel calls
  • 2 GB RAM
  • 2 CPUs (ca. 2 GHz)
  • 80 GB hard disk space
  • 1 network connection
Callisto Appliance “Medium”
  • up to 240 parallel calls
  • 4 GB RAM
  • 4 CPUs (ca. 2 GHz)
  • 80 GB hard disk space
  • 1 network connection
Callisto Appliance “Large”
  • starting from 240 parallel calls
  • 6 GB RAM
  • 8 CPUs (ca. 2 GHz)
  • 80 GB hard disk space
  • 1 network connection
  • max. 960 parallel calls per appliance
PBX (TVA/PBX) Cisco IP-PBX: CUCM, HCS, Webex (Unified CM), BExk, UCx00


The following products have been tested for interoperability with the Callisto platform.

Note: Various modules of the Callisto platform may also be compatible with other IP-PBX systems. Contact us if you have a specific project.

Manufacturer System Version
Cisco Systems Inc. Unified Communications Manager 7.x, 8.x, 9.x, 10.x, 11.x, 12.x, 14.x
Cisco Systems Inc. Unified Communications Manager Business Edition 6000 8.6, 9.x, 10.x, 11.x, 12.x, 14.x
Cisco Systems Inc. Unified Communications Manager Business Edition 7000 8.6, 9.x, 10.x, 11.x, 12.x, 14.x
Cisco Systems Inc. Hosted Collaboration Solution (HCS) 8.6, 9.x, 10.x, 11.x ,12.x, 14.x
Cisco Systems Inc. Cisco UCM Cloud
Cisco Systems Inc. Cisco Unified Presence Service (CUPS) 8.x, 9.x, 10.x, 11.x, 12.x, 14.x
Cisco Systems Inc. Cisco Jabber 7.x, 8.x, 9.x, 10.x, 11.x, 12.x, 14.x
Cisco Systems Inc. Cisco Webex Client
Diverse Android for Smartphones and Tablets upon request
Apple Inc. IOS for Smartphones and Tablets upon request
CTModule AG COC Operator Console Windows 7.x, 8.x, 10.x, 11.x

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