Answering Machine Detection for Asterisk
- Best in Industry Accuracy and Response Time
Patent-pending algorithms deliver the highest accuracy and call delivery rates for automated calling applications. - Asterisk Integration
- SIP Call Flows
- Asterisk patch available for simple integration
- Optimized Detection
- Configurable Pre-Connect Tone Detection
- Post-Connect Analysis
- End of Greeting
- Resilience Against Different Calling Conditions
The statistical models used by Lyra have built-in robustness to background noise and network conditions. - Standards-based Integration via SIP
No proprietary Application Programming Interfaces. Support for both PSTN and VoIP networks. - Operations in a Dynamic Environment
Lyra uses call progress confidence measure, which allows it to adapt the call progress according to contact center operating conditions.
The Lyra Asterisk software application from Sangoma software provides the most accurate and resilient Answer Machine Detection (AMD) engine, enabling fast and reliable real-time call classification and drives the efficiency and quality of automated calling applications to unmatched levels.
To maximize the efficiency of the outbound call center operations, accurate Answer Machine Detection (AMD) technologies are a must. AMD (also known as Call Progress Analysis or CPA) is important, as it is the technology that assigns a Contact Center agent only to calls that involve a human response – maximizing productivity.
Contact Center operations must also comply with very stringent regulations, such as maintaining a low percentage of dropped calls, following no nuisance regulations, and connecting to an agent in less than 2 seconds. This puts a lot of pressure on existing CPA technologies because many rely on simple rule-based algorithms that provide sub-optimal performance, which in effect lead to poor efficiencies in the Contact Center.
Lyra uses new, patent-pending technology to provide more accurate and efficient CPA. With algorithms based on neural networks and statistical learning, Lyra delivers the highest accuracy and call delivery rates for automated calling applications and ensures fast and accurate automated call classification, which directly translate into improved efficiency of agents and higher quality customer interactions. With a higher automation rate and better use of agent time, this solution can literally save millions of dollars in yearly annual operating costs.

Technical Specifications
The Lyra AMD for Asterisk software runs in SIP networks as a back-to-back user agent (B2BUA).
SIP/ Session Control Interface:
- B2BUA as Relay Server or Outbound Proxy
- SIP as per RFC 3261
- 3PCC as per RFC 3725
- Sangoma SIP Extensions for CPA
Media Processing:
- Patent-pending Call Progress Analysis Neural Network
- Configurable pre-connect analysis (International
pre-connect tones such asringing, Busy, SIT) - Post-connect analysis
- End-of-Greeting detection
- Configurable pre-connect analysis (International
- DTMF per RFC 2833
- Built-in recorder for tuning and quality/accuracy audits
Benchmarking:
Sangoma has run its own internal benchmarking of various technologies, out-of-the-box, without tuning; using a database of live recordings of approximately 5000 calls. Sangoma provides 15% increase in accuracy over competing technologies. While this does not constitute a guarantee, live deployments should experience similar results and performance over a statistically
significant sample of calls.
Management Tools:
- Logging
- Event viewers
- Automated CSV file generation for quality/accuracy audits

Trial Version
Full Version
Lyra AMD for Asterisk: Confidence-Based Call Progress Analysis Engine is sold on a per channel license and includes SIP B2BUA and Recording software for accuracy analysis.
| Option 1: Buy It Now Get the benefits of lower up-front costs, when you purchase a permanent license. Annual support and software maintenance agreements are available. To purchase now, Contact an Empowered by Sangoma Distributor, Reseller, or Solution Partner near you. Look for the Empowered by Sangoma Logo. ![]() . |
Option 2: 30-Day Subscription Start using software immediately and pay as you go. Purchase a license for $8.95 per channel, support included. No contracts, no commitments. Order for the amount of channels required.It’s easy to renew your licenses! There’s no need to re-install the software – simply replace the expired license file with a new one. |


