VoxPort Packet (VPP)

“Software-based SIP endpoint for active VoIP and VoLTE quality testing.”

What is VPP?

VoxPort Packet (VPP) is a software SIP endpoint designed for active testing and measurement of VoIP and VoLTE services within IP networks.
As a core component of the MultiDSLA platform, VPP enables operators, integrators, and vendors to generate and analyze real voice calls, measure speech quality with POLQA®/PESQ®, and even simulate network impairments for resilience testing.

Key Features

• Voice Quality Metrics
  ▫️Objective MOS scoring using POLQA® and PESQ®.
  ▫️Support for narrowband, wideband, and super-wideband codecs (AMR-NB/WB, EVS, Opus).
• Active VoIP/VoLTE Testing
  ▫️SIP and raw RTP call support.
  ▫️Encode/transmit speech samples, decode and analyze received streams.
• Packet Impairment Simulation
  ▫️Define precise patterns of delay, jitter, or packet loss.
  ▫️Reproduce real-world conditions by importing overlays from live captures.
• Codec Management
  ▫️Manage codec switching and rate adaptation.
  ▫️Overlay tools for Codec Mode Requests (CMR) synchronized with speech transmissions.
• Network KPIs
  ▫️Measure packet loss, jitter, and SIP message timing.
  ▫️Identify codec or network-related performance issues.
• MultiDSLA Integration
  ▫️Centralized configuration, orchestration, results collection, and reporting.
  ▫️Combine with DSLA (hardware) and OSS (smartphone-based) agents for end-to-end QoE analysis.

Benefits for the Client

• End-to-end realism – test VoIP/VoLTE services with actual SIP endpoints.
  
• Deep QoE insight – beyond MOS, capture KPIs and root cause indicators.
  
• Flexible impairment testing – reproduce degradations to assess resilience.
  
• Versatile codec coverage – validate next-gen services including EVS and Opus.
  
• Efficient integration – part of the MultiDSLA ecosystem for lab and live environments.

Why VPP is Different ?

• Software-based scalability – deployable across distributed test networks.
  
• Advanced impairment overlays – unique simulation of jitter, loss, or codec shifts.
  
• Codec-rich testing – from legacy to 5G-ready codecs (EVS).
  
• Centralized supervision – fully integrated with MultiDSLA controller and reporting.
  
• Trusted reference tool – widely used by operators and test labs worldwide.

Typical Use Cases

• Lab testing of VoIP/VoLTE implementations under controlled conditions.
• Continuous network monitoring of SIP-based services.
• Validation of EVS codec deployments in mobile networks.
• MCPTT/MCx service quality testing.
• Drive testing with packet impairment simulation.

Services & Support (What We Offer)

• VoIP/VoLTE Assessment – baseline analysis of SIP-based services.
  
• Deployment Services – integrate VPP into lab and operator environments.
  
• Overlay Workshops – simulate impairments with custom overlays.
  
• Optimization Services – codec tuning, KPI thresholds, and reporting.
  
• Managed Testing Services – VPP-enabled active testing delivered as-a-service.