1. NGN VoIP

ZCTT INTS-NGN network tester, designed specifically for NGN network, is suitable for NGN network service inspection, protocol surveilliance, netwrok device performance verification and voice quality ananlysis. Meanwhile, it supports VoIP test by detailed decoding, call procedure and call loss location.

FUNCTION
INTS-NGN is equipped with NGN simulation, NGN monitorin, NGN speech quality evaluation and VoIP test.

The NGN simulation offers protocol consistency test, device performance test and mighty state-machine editing function with abundant test cases. The NGN monitoring, specially for testing NGN network service and NGN device, offers detailed decoding analysis, call loss probability analysis, call trace, call and traffic statistics, along with media gateway performance analysis. The NGN speech quality evaluation, especially for testing speech service quality, offers analog line testing and RTP stream testing. The VoIP test focuses on VoIP QoS analysis.

Protocol Conformance Verification
The differences between device working flow and protocol will bring a series of problems to the internetworking of the devices, and service expansibility of operators. The INTS-NGN tests the operation conformance condition between NGN network devices by different vendors with reference from standard so as to locate problems causing inconsistency, and evaluate device internetworking capability objectively.

  • Omni bearing test: not only testing whether messages generated by device comply woth specifications or not, but also testing devices handling mechanism.
  • Various kinds of simulation: testing various compatibilities by simulating the MG or MGC.
  • Controllable test procedure, controlling every step of the test in multiple ways.
  • Over-protocol measuring definition: customizing special message processing procedure and message content beyond protocol scope concerned
  • Supporting compatibility test of multi-protocol

Device Extreme Capacity Test
How to evaluate real process capacity of NGN device at the beginning of network building when little traffic to handle? It becomes a problem for NGN operators to make an objective estimation on network service performance and make reliable service developing project. The INTS-NGN provides solutions for solving such kind of problem: it generates a large volume of calls to user's soft-switch device and detects response of performance quota :

Device extreme capacity on processing following protocols are supplied :

  • MGCP
  • H.248
  • SIP
  • Multi-protocol collaboration (SIP, MGCP, H.248, ISUP, etc.)
  • Multiple index load test

Users can use the Load Profile tool to edit load files, and carry out different load test. The INTS-NGN offers several test modes that can be set flexibly based on BHCA,number of calls per second, and number of calls during a period etc.

State-machine
It is difficult no only for device manufacturers and research institutes, but also for operators to conduct comprehensive simulation test including:

  • extraordinary test excluded in protocol scope
  • protocol fault

The NGN simulation module provides mighty state-machine editin tools for users to set test state-machine according to their respective requests.

The following conditions are defined as trigger of state transferring :

  • Auto, automatically tranferring
  • Time out
  • Match, condition matches transferring
  • Unexpected message, transferring while receiving unexpected message
  • Rev message, transferring while received specified message

Users can set state transferring condition according to the test requirements, and copy data to the database or memory so that state-machine can use it in other transactions.

Users can set different actions for each state :

  • send message
  • reset counter
  • database query
  • copy data
  • set key

Users can conduct various kind of operations to the counter, database and Cdr Buffer. Through offered state-machine editor, users can easily edit required state-machine for test, which, after loading test protocol packets, becomes NGN device test station with powerful function.

Test Reference Cases
Editing test cases requires that users should have a thorough acquaintance to the working principles and flows of every kind of protocol, along with a deep understanding of all kinds of operations defined in standards. Moreover, devices manufactured in different factories may differ from each other on their working flow and specification. These differences inevitably make editing test cases even more difficult.

In order to solves the problem mentioned, the INTS-NGN enclose a great deal of reference cases, including cases defined in test specifications and cases specified for some manufactures. In addition, test cases according to users' request can also be integrated into the software kit for customer.

To most users, the built-in cases are sufficient for solving problems in daily test. As for super users who want to conduct some sophisticated tests, we will offer more detailed instruction.

Note: Training course on advance test cases editing is available from ZCTT, which users can choose.

Deep Decoding
The INTS-NGN gives a detailed decoding analysis on raw data. Detailed decoding analysis not only gives thorough breakdown judgement for maintenance personnel, but also helps them to have a further understanding about the specifications and devices.

  • Decoding explanation detailed to field bit and correlated to original data.
  • ABNF and ASNI modes display
  • Message filter supporting selection of IP address, telephone number, message type, important message parameters, time, original data, etc.
  • Display link from detailed message-decoding explanation to call flow record, supporting multi-protocol correlation
  • Enabling label making skipping from label of one message to another.

Call Loss Analysis
It is really important for service maintaining and network optimizing to locate call loss and find the reason quickly. INTS-NGN, with the function of makin real-time and historical expert analysis on calls in NGN network, locates network problems, and finds otu the main trouble devices or entities influencing network Call Completion Rate to increase network QoS rapidly.

By referring to call loss, INTS-NGN detects call fault on specified device, and analyze probability causes:

  • overall call loss causes analysis of according to protocol
  • overall call loss analysis according to protocol and time segment distribution
  • call loss analysis of MGC (group) and MG (group) according to protocol
  • call loss cause sorting
  • correlation display analysis from the analysis of the call loss probability cause to call flow, filtering on cause
  • call loss analysis according to protocol and the caller/callee
  • call loss cause distribution analysis

Call Trace
Call Trace describes call flow by collecting related protocol messages from call setup to call release along with decoding in every phase in the flow. For NGN network maintenance, a detailed call flow analysis makes it more convenient and simpler to locate mistake, by which operator can immediately find out where mistakes take places.

Call trace mainly has the following functions:

  • Tracing analysis of procedure from SIP call setup to release, including URI resolution between SIP proxy and location server
  • Tracing analysis of call control procedure from setup to release between MGC and MG in MGCP mode
  • Tracing analysis of call control procedure from setup to release between MGC and MG in MEGACO/H248 mode
  • Tracing call flow of SS7 in SIGTRAN
  • Tracing analysis of H323 call procedure, from setup to release, including RAS authentication and logout, H225 signaling setup and release, H245 logical channel negotiation, fast activation and tunnel mode.
  • Analyzing setup of speech circuit by SDP in SIP, MGCP and H248 mode.
  • Recording call flow of all kinds
  • Filters of MGC address, MG address, caller/callee's address

Call & Traffic Statistic
The statistic analysis of call and traffic refers to the voice-monitor based information collection required by users. It offers users a full and accurate statistics for evaluating the status of the whole network and some specified service operation.

The INTS-NGN provides protocol-oriented statistics:

  • overall analysis of call load, call completion rate and call answer rate
  • analysis of every MGC and MG
  • overall analysis in time distribution
  • analysis of MGC group and MG group
  • analysis of specified caller address and callee address including area code and domain name
  • analysis of multi-protocol calls
  • call sorting
  • distribution of call duration

MG (Media Gateway) Performance Analysis
Media Gateway Performance Analysis refers to conducting multi-parameter statistic on specified media gateway, and getting detailed information about the gateway after analyzing these parameters. It offers detailed analysis report for maintenance personnel to locate breakdown and make upgrading decision.

Following objects are involved in statistics for respective protocol :

  • overall call setup time
  • call setup time for every MGC and MG
  • call setup time for every MGC group and MG group
  • call setup time in period interested
  • utilization rate of call bandwith
  • utilization rate of bandwith of every MGC and MG
  • distribution analysis of call performance
  • correlated display from the analysis of call performance to call flow
  • analysis of call frequency

VQM (Voice Quality Measurement)
With full conformity to ITU specifications, VQM uses the PESQ algorithm to evaluate end-to-end voice quality, and offers operators objective evidence for judging. PESQ (ITU-T P.862) is the latest recommendation for evaluating all kinds of end-to-end network qualifications, voice encoding and decoding by appreciable standards cohering with people's feeling of voice reception. It's superior to other former methods evaluating voice quality from the following aspects :

  • sole voice quality test standard applicable to real-world network environment currently
  • evaluating voice quality under different delay environment by handling distortion
  • recommendation of ITU to test narrow-band voice
  • applicable not only to voice encoding test but also to end-to-end test

From the sketch map of the VQM working principle below, analysis report of end-to-end voice quality comes after a comparison between standard voice and voice passed the network.

VQM is applicable to different network conditions such as VOIP and PSTN network.

Analog Line Voice Quality Test
Analog lin voice quality test simulates the whole call procedure, including voice and signaling by simulating real world telephone connection with the direct connection to the analog line interface. Meanwhile, operator can listen in calls in connection.

The test project is taken as follows : connecting directly to IAD other analog device on both parties of the call; setting up a connection between the two ports va NGN or telepone network; sending standard voice stream from calling tester to another; analyzing voice quality by comparing received voice and the standard voice expected.


RTP Voice Quality Test
The RTP voice quality test offers operators more abundant test measures, through the analysis of voice quality under different network load. The tester can simulate real world network environment, generate multiple end-to-end voice streams, designate destination addresses for multiple voice streams, and conduct PESQ analysis for them.

To voice quality test in network, the RTP voice quality test means :

  • controlling the number of voice flow and adjusting network load
  • conducting multi-casting test
  • supporting various coding such as G.711, G.723 and G.729; inspecting speech quality difference caused by different coding.

Solution of multiple voice RTP streams quality analysis is shown as the following :

H.323 Protocol Analysis

  • Accurately extracting different H323 protocol packets, including H.2250º¢, H.245º¢RTPº¢, RAS, etc. from TCP/UDP packet
  • Giving protocol packet mighty decoding analysis in either ASN1 or PER formats, detailed to bit
  • Supporting protocol data collection filter and display filter
  • Auto correlated display associated with specified call flow

VoIP Call Specialist
The module offers a real-time online test and an in-office specialist system, which can be run anytime offline.

  • Call statistics on specific gateway (IP address), region (area number)
  • Real-time call completion rate curve
  • Call loss causes statistics of gateway, region
  • Statistics of call loss probability causes according to gateway, region and number
  • Sorting call bidding and call connected
  • Statistics of the average conversation time and distribution
  • CDR generation
  • Flexibility output of report into MS Excel tool
  • Click-in for deep analysis

VoIP Call Inspection
Due to the difference between VoIP and the traditional speech communication, voice IP packet, which is compressed, operated, tranferred and decompressed by different network entities, is certainly to be distrubed and distorted conducing to user complaint.

Concrete features are supplied to monitor calls in processing :

  • delay, jitter and packet loss rate statistics on both call directions
  • QoS evaluation according to delay, jitter and packet loss rate
  • report of unidirectional call and call drop, including such information as call party IP address, port number and time
  • statistics of voice code for specified call

back to top

FEATURES

  • Multi-protocol coordination test
  • Independent platform for easy adding protocol and applications
  • Full supporting protocol simulation
  • Customization of test message sequence
  • PESQ voice evaluation
  • PC based expert analysis software on common, quickly and efficiently solving network problems
  • Steady-going hardware for supporting high traffic

back to top

PROTOCOL / STANDARD

Technology Domain
Protocol & Standard
Notes
NGN
MGCP RFC3435
SIP RFC3261
H,248/MEGACO RFC3015
ISUP ITU-T
SIGTRAN IETF
SCTP RFC2960
M2UA RFC3331
M3UA RFC3332
BICC ITU-T Control protocols irrespective to bearing functionality
VoIP
ITU-T H.323 Provides a foundation for audio, video, and data communication across IP - based networks, including the Internet.
ITU-T H.225 Receiving and transmitting capabilities as well as mode preference from the receiving end, logical channel signaling, and control and indication.
ITU-T Q.931 Manages call setup and termination
ITU-T G.711, G.722, G.723,G.729 Voice Coding
RFC 1889 RTP / RTCP

back to top

SPECIFICATIONS

  • Power Supply : AC220V±10%, 48Hz-66Hz
  • Working Temperature: -10ºC ~ +45ºC
  • Storage Temperature: -20ºC ~ +70ºC
  • Reliability: MTBF > 20,000 hours
  • Processing capability: 10M/100M line speed capturing
  • Time stamp accuracy: 100ns

back to top

 

Back to Top | ADSL Advanced Testes DLT2 | ZCTT MNSS7™ | QSZ225 | SuperDXC |