Voice Test Platform (VTP)

The Voice Test Platform (VTP) tests the continuity, and voice quality of Circuit-Switched (CS) and Packet-Switched (PS) voice calls. The platform verifies the speech path and, in each direction, is capable of transmitting reference sampled analog voice files from disk and recording their corresponding versions on disk after passing through the CS or PS networks. Multiple simultaneous calls are supported. The VTP includes a licensed Perceptual Objective Listening Quality Assessment (POLQA) algorithm to analyze the voice quality of recorded audio.

The VTP hardware consists of a host processor and an analog Foreign Exchange Office (FXO) telephony card seated in a 19” rack mountable chassis. The host processor is a commercial x86 PC, running the Microsoft Windows 7 (64-bit) operating system.

The Python-based script engine (CPython 3.5.3) in the VTP allows for automated, application-specific testing, carried out with test scripts. In addition to controlling the internal voice servers, the script engine can interface to other network elements such as a User Terminal, Network Emulator, or Physical Layer Tester to test end-to-end call scenarios. Users can quickly build test cases, using the familiar Python script language with a rich library of call processing APIs included with the platform. The analog and VoIP channels are highly configurable, allowing fine control over voice call test scenarios. The VoIP channels are supported by a full featured SIP stack, providing SIP Agent server and client features and a variety of codecs including G.729 and Opus. The FXO channels operate with North American and ITU Standards and variants covering most signalling and supervision features.

  •  

  • FXO INTERFACE

    Channels

    0 - 16

    Connector

    RJ21 telco (RJ11 via breakout box)

    Compression

    µ-law
    A-law

    Supervision

    Ring detection, Loop disconnect
    Reversal detection, Loop voltage,
    Loop current

    Signaling

    Off hook, Flash, DTMF, Pulse dial

    Protocols

    Bell 202 FSK Type 1 Protocol
    ITU-T V.23 FSK - British Telecom standard
    ITU-T V.23 FSK - General ETSI standard
    DTMF - General ETSI standard
    DTMF - Sweden/Finland variant
    DTMF - Denmark variant

    Onhook Audio Detect

    Caller ID, DTMF, Audio logging

    4-wire support

    Via external 2-4 wire converters

    VoIP INTERFACE

    Channels

    0 - 256

    SIP Compliance

    RFC 3261, RFC 3262, RFC 4028, RFC 3960, RFC 2976, RFC 2833, RFC 2782, RFC 3551, RFC 2474, RFC 5246

    Codecs

    ITU-T G.711 µ-law
    ITU-T G.711 A-law
    ITU-T G.729
    GSM Adaptive Multi-Rate (AMR)
    GSM Enhanced Full-Rate (EFR)
    GSM Adaptive Multi-Rate Wideband (AMR-WB)
    Opus

    Features

    Inbound/Outbound Registration
    Authentication
    NAT transversal
    Options method
    SDP parsing
    Subscribe/notify messages
    Customized SIP headers
    Configurable SIP timers
    Redirect responses

    GENERAL PURPOSE INTERFACE

    Ethernet

    1 x 10/100/1000 Base T

    USB

    4 x USB 2.0, 2 x USB 3.0

    Video

    VGA, DVI

    Audio

    Standard PC Audio

    CAPABILITIES

    Test control

    Python scripts

    Script APIs

    Call processor, UT monitor & control, BGAN network emulator, POLQA

    Audio paths

    Analog, file

    Voice path continuity check

    Via tones or POLQA MOS,

    Voice quality evaluation

    POLQA

    MECHANICAL/ENVIRONMENTAL

    Form factor

    19” / 2U rack mount

    Size

    L 51 cm x W 43 cm x H 9 cm
    L 20 in x W 17 in x H 3.5 in

    Weight

    Approx. 11 kg (24 lb)

    Power connector

    IEC 320 male

    Voltage

    100-240 VAC, 50/60 Hz

    Current (typical)

    Approx. 0.6 A rms at 115 VAC

    Operating temperature

    10°C to 35°C

    Operating humidity

    20% to 90% relative humidity, non-condensing

    Regulatory

    FCC, CE and RoHS compliant
    Safety: EN60950-1
    Emissions: EN55022 Class A
    Immunity: EN55024

  • VTP Data Sheet

  • Contact Us
  • © 2017   Square Peg Communications Inc.