VoIP Test Applications

Zumara protocol analysis & simulation software sets the benchmark standard for VoIP test & development. This software tool provides a powerful, compact and cost effective solution for testing SIP, SIPt, H.323 plus interoperability between these protocols and legacy protocols such as SS#7, ISDN, Q-SIG or V5.

Zumara software enables the use of a PC NIC or LAN adapter(s) to simulate multiple LAN endpoints for VoIP protocol analysis and simulation. Additionally, Clarinet hardware interface pods are available for E1/T1 and S/T-U, these interface pods connect seamlessly to your PC host via USB. Any combination of up to seven LAN, Clarinet E1/T1 or S/T-U pods may be connected & controlled simultaneously by Zumara.

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Optional SCTP support is available replacing TCP/UDP for evolving VoIP applications. Find out more.

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Key VoIP Test Applications Include:-

  • VoIP & WAN Interoperability Testing
  • VoIP Development & Manufacture
  • Conformance Testing of SIP (RFC3261) and H.323 (H.225a)
  • Speech Quality Testing (PESQ option)
  • VoIP Fault Diagnosis in the Field & Lab
  • Accurately measure delays & identify where they occur

Measure delays, quality of service, jitter, loss, or listen to WAV files created from the RTP payload and the WAN bearer channels through the PC host sound card, for a direct comparison. Make PESQ measurement to gain a PESQ score, MOS score, noise score & speech score. View a PESQ result trace.

SIP Features

  • One of more PC host NIC or external LAN adapters may be used to support multiple endpoints together with OEM software such as SIP proxy. Proprietary LAN hardware is no longer required.
  • Generate 50 independent outgoing calls per endpoint with user defined start delay, duration and inter-call delay.
  • Supports customisation of SIP headers and message body which may be checked or launched without checking if invalid content is required for test purposes.
  • Create a profile library with different call flows/types.
  • WAV files may be played as RTP and received RTP may be recorded or played through the host sound card.
  • Optional perceptual evaluation of speech quality (PESQ) measurements including PESQ score and MOS score may be made using the PC NIC or network adapters. When generating or responding to a call, transmit RTP voice packets encoded with various codec formats.
  • Clarinet interface pods are fully supported by Zumara and are available for E1/T1 and ISDN BRI, allowing users to send and receive calls on both sides of a Gateway with full synchronisation.
  • Provides total network visibility.
  • Session initiation protocol for telephones (SIP-t or SIP-i) is supported with an easy editor to allow ISDN User Part (ISUP) parameters to be sent through a SIP network.
  • SIP RFC3261 TTCN conformance test suite available. View sample test case verdict.

H.323 Features

  • Define the stack of emulators from the IP layer to the H.323 layer.
  • User-User IE using PER ASN 1 may be coded easily via an editor which simultaneously displays the HEX value and the ASN 1 notation. Templates of ASN 1 encoded User-User messages are provided.
  • Real time protocol analysis provides an invaluable decode of H.225/H.245 messages & sequencing. A trace of primitives used between the different layers clearly shows the ‘commands’ and ‘indications’ exchanged.
  • Simulate ISDN or SS#7 calls (E1/T1 Clarinet pod) on one Gateway port while responding to, and simulating H.323 calls on another Gateway port (LAN NIC or adapter).
  • H.323 (H225a) TTCN Conformance Test suite available.
  • One of more PC host NIC or external LAN adapters may be used to support multiple endpoints together with OEM software such as H.323 Gatekeeper. Proprietary LAN hardware is no longer required.
  • Generate 50 independent outgoing calls per endpoint with user defined start delay, duration and inter-call delay.
  • Create a profile library with different call flows/types.
  • WAV files may be played as RTP and received RTP may be recorded or played through the host sound card.
  • When generating or responding to a call, transmit RTP voice packets encoded with various codec formats.
  • Clarinet interface pods are fully supported by Zumara and are available for E1/T1 and ISDN BRI, allowing users to send and receive calls on both sides of a Gateway with full synchronisation.
  • Provides total network visibility.

Test LAN - WAN Interoperability
Zumara software enables simultaneous monitoring or call generation while connected to multiple network nodes, allowing comprehensive interoperability testing. An ISDN call may be generated and answered as an H.323 call or a SIP call may be generated and answered as SS#7, with all events decoded and time stamped in one Window using one very accurate reference clock. The LAN RTP payload and the WAN user channel may be turned in to WAV files for audible comparison using the PC host sound card.

Up to eight LAN protocol layers may be defined for simulation or sixteen for analysis. The user may first check the exchange of 802.3 frames or perform a ping while simulating to check the physical layer. The user may build and save any H.323 or SIP message content required for test purposes either valid or invalid.

Measure Quality of Service - PESQ
PESQ (perceptual evaluation of speech quality) is ITU-T recommendation P.862, which replaces PSQM (P.861) for end-to-end voice quality measurement in real network conditions using VoIP, POTS, ISDN, Q-SIG, SS#7 or GSM. The measurement provides a MOS score in the range of 1 to 5 where 1 is unacceptable and 5 is excellent. A typical range for VoIP is 3.5 to 4.2. Zumara can measure PESQ from LAN to LAN or from LAN to WAN through a Gateway. Several PESQ measurements may be made during one long duration call, to test speech quality over time as network demands fluctuate. PESQ score, MOS score, noise score & speech score are provided. View a PESQ result trace.

PRACK
Our SIP simulator now supports PRACK as defined in RFC3262 to test and emulate provisional responses.

Test Invalid Content
The Zumara GUI allows the user to select auto-update or no-update of fields within a SIP message. This makes it easy to use reliable automatic update or to define invalid or un-supported message content and launch without parse for test and development purposes.

RTP Without SIP or H.323
Zumara can generate an RTP flow from one IP address to another IP address without the need to use SIP, H.323 or any proprietary protocol to establish the communication. RTP received by Zumara may be played through the PC host sound card for audible analysis or may be used to generate a PESQ and MOS score using our optional PESQ key.

G.729 Codec (Option)
With this option installed, Zumara will automatically connect a G.729 codec if specified in an incoming ‘INVITE’ message for SIP or the H.245 content of an incoming ‘SETUP’ message for H.323. It is also possible for the user to select G.729 when running the optional PESQ (perceptual evaluation of speech quality) measurements. A license for 2 or 50 channels is available as an option.

SIP Conformance Test
SIP is defined in RFC3261 and we offer a TTCN conformance test package to test the full protocol compliance of a Proxy, UA or Redirect server with five hundred and thirty individual test cases in total. In order to reduce cost, Zumara can register and act as several LAN endpoints. The RFC3261a conformance package is available as a system option and has just been updated to reflect recent modifications. ETS Test Case Verdict example.

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