Thursday, November 19, 2015

Sevana CATI Dialer. Case study.

dialer-schema


Our client inquired Sevana for NIPO CATI dialer that could effectively work in predictive mode being able to play sound file to the interviewee.


Sevana CATI Dialer utilizes asynchronous capabilities of Python framework and flexibility of Asterisk architecture to work with majority of Asterisk based telephone systems (e.g. FreePBX) providing standard interfaces for reporting and statistics. The fact that single Sevana CATI Dialer server can process requests from several NIPO and is flexible in upscaling was very much appreciated by the client.


During project implementation our team also solved tasks for telephone database pre-processing allowing quick project launch and leading to full customer satisfaction.



Sevana CATI Dialer. Case study.

Wednesday, November 18, 2015

AQuA (Audio Quality Analyzer) integration with VoIPmonitor

AQuA


AQuA is a proprietary technology of Estonian business entity Sevana Ou. It implements a proprietary perceptual model based on research of several recognized scientists that determined frequency bands specific for human perception of audio signals. AQuA main return value is percentage of audio quality similarity between reference and test sound signals. AQuA can work with audio from 8kHz, 16 bit, Mono up to 192kHz, 32 bit, Stereo and has lots of parameters to adjust system perceptual model for client specific test scenarios to achieve best performance and accuracy.


Latest AQuA version provides the following sound quality metrics:


  • MOS score according to P.800 – reliable objective MOS scores from 1 to 5

  • Percentage of sound quality similarity between reference and test audio

  • Duration distortion

  • Delay or advancing of audio signal activity

  • Sound signal activity mistiming

  • Signal spectrum damages

  • Signal spectrum vibration

  • Unidirectional signal spectrum analysis: amplification or attenuation

  • Most affected signal spectrum: low, medium, high bands

  • Average pitch

  • Pitch deviation

  • Pitch frequencies distribution distortion

  • Quantization steps distribution distortion

  • Amplitude clipping level

  • RMS

  • Sound signal: Minimum Energy, Maximum Energy, Average Energy

  • Sound signal: Min. Sample, Max. Sample, Average Sample

AQuA waveform analysis technology has been recognized in voice quality assessment across various networks, both TDM and packet switched. AQuA algorithm does not depend on the language, can work with audio files of arbitrary (from 10 seconds to several hours) duration.


VoIPmonitor


VoIPmonitor is an open source network packet sniffer with commercial frontend for SIP RTP and RTCP VoIP protocols running on Linux. VoIPmonitor is designed to analyze quality of VoIP call based on network parameters – delay variation and packet loss according to ITU-T G.107 E-model which predicts quality on MOS scale. Calls with all relevant statistics are saved to MySQL or ODBC database. Optionally each call can be saved to pcap file with either only SIP protocol or SIP/RTP/RTCP/T.38/udptl protocols. VoIPmonitor can also decode speech and play it over or save it to disk as WAV. Supported codecs are G.711 alaw/ulaw and commercial plug-ins support G.729a G.723 iLBC Speex GSM SILK iSAC OPUS.


Integration benefits


AQuA wrapper allows substitute PESQ when using VoIPmonitor to extend possibilities for intrusive voice quality analysis with AQuA technology:


  • Use of flexible AQuA algorithms for perceptual voice quality analysis (both narrowband and wideband)

  • Filtering analyzed calls based on IP

  • Filtering analyzed calls based on called party number

Integration


Integrating Sevana AQuA into VoIPMonitor is a sequence of the following actions:


  1. Request AQuA wrapper for VoIPmonitor at Sevana web site: http://sevana.biz/downloads/

  2. Unpack all files under /usr/local/sbin folder

  3. Make sure aqua-v (aqua-wb) rights are set to executable

  4. Adjust settings in aqua_wrapper.conf

  5. Set parameters at voipmonitor.conf
    • mos_lqo_bin=aqua_wrapper.sh

    • mos_lqo=yes

    • mos_lqo_ref=<file>

    • saveaudio=wav


  6. In the database one should add records with IP and mask or phone number in the following tables: filter_ip or/and tilter_telnum. Field mos_lqo has the following values:
    • 0 – do not invoke mos_lqo_bin

    • 1 – mos_lqo_bin processes RTP streams with specified originating IP

    • 2 – mos_lqo_bin processes RTP streams with specified destination IP

    • 3 – process incoming and outgoing RTP from specified IPs


Example:


INSERT INTO `filter_ip` (`id`, `ip`, `mask`, `direction`, `rtp`, `sip`, `register`, `graph`, `wav`, `skip`, `script`, `mos_lqo`, `hide_message`, `note`, `remove_at`) VALUES (1, 2887453184, 24, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 3, NULL, NULL, NULL);



AQuA (Audio Quality Analyzer) integration with VoIPmonitor

Friday, November 13, 2015

Bird Technologies introduces digital signal booster



Bird Technologies, a leading provider of RF components, subsystems, test equipment, and services, today introduced the 614 Series digital signal boosters that are designed to increase the signal strength of land-mobile/public safety communications systems operating at either 450 to 470 MHz or 470 to 488 MHz. The highly configurable system combines the benefits of programmable digital RF filters, the ability to view changes to filter characteristics while viewing their effects in real-time, browser-based configuration and management, and many other features.


Read more…: Bird Technologies introduces digital signal booster



Bird Technologies introduces digital signal booster

Friday, November 6, 2015

Anritsu first test company to provide LTE-A 3CA Support to three North American carriers



Anritsu Co. announces support for LTE-A 3 Carrier Aggregation (3CA) Carrier Acceptance Test (CAT) requirements at two additional major North American carriers, building on the first announcement of 3CA support for a third carrier in September.


Read more…: Anritsu first test company to provide LTE-A 3CA Support to three North American carriers



Anritsu first test company to provide LTE-A 3CA Support to three North American carriers

Thursday, November 5, 2015

Wi-Fi/LTE-U tests lack LTE equipment


The Wi-Fi Alliance is conducting tests this week on the coexistence of Wi-Fi and LTE-U. LTE-U, or LTE in unlicensed spectrum, has already been tested by the chipmakers who want to build LTE-U chips, and they claim that LTE can share the 5 GHz band without degrading the performance of Wi-Fi networks.


Companies that are focused exclusively on Wi-Fi equipment are not so sure, and the Wi-Fi Alliance has convened a Coexistence Task Force to conduct futher tests. The association has also asked the Federal Communications Commission to await the results of these tests before approving any LTE-U equipment for commercial use.


The Wi-Fi Alliance wants to conduct tests using actual LTE base stations, but none of the manufacturers supplied equipment for its tests. The Alliance said that LTE transmissions for its tests will be produced with an LTE signal generator.


“If/when LTE equipment is available, the LTE studies shall be performed using actual equipment, noting the manufacturer, model and revision numbers,” said the Alliance. “As implementations may vary considerably, studies must be repeated with each different equipment set available.”


“The desired criteria is that the introduction of a co-channel LTE network will not impact an existing Wi-Fi network’s performance any more than introduction of a similar co-channel Wi-Fi network,” wrote the Wi-Fi Alliance in its coexistence guidelines document.


Specifically, these are the criteria the alliance is proposing:
Data traffic:


  • Throughput for Wi-Fi with Wi-Fi greater than or equal to throughput for Wi-Fi with LTE.

  • Packet loss for Wi-Fi with Wi-Fi less than or equal to packet loss for Wi-Fi with LTE.

  • Frame re-transmission rate for Wi-Fi with Wi-Fi less than or equal to packet loss for Wi-Fi with LTE.

Beacons and power save signaling frames:


  • Packet loss with Wi-Fi less than or equal to packet loss for Wi-Fi with LTE

  • Jitter with Wi-Fi less than or equal to packet loss for Wi-Fi with LTE.

VoIP and real-time video:


  • Latency with Wi-Fi less than or equal to packet loss for Wi-Fi with LTE.

  • Packet Loss with Wi-Fi less than or equal to packet loss for Wi-Fi with LTE.

  • Jitter with Wi-Fi less than or equal to packet loss for Wi-Fi with LTE.

  • Frame re-transmission rate for Wi-Fi with Wi-Fi less than or equal to packet loss for Wi-Fi with LTE.

For mobile operators, LTE-U offers a way to maintain a connection for users who might otherwise not be able to access the network in congested areas. It also offers a way to count time spent in unlicensed spectrum against users’ data plans, instead of losing potential revenue each time a customer jumps to Wi-Fi.


The post Wi-Fi/LTE-U tests lack LTE equipment appeared first on RCR Wireless News.




Read more…: Wi-Fi/LTE-U tests lack LTE equipment



Wi-Fi/LTE-U tests lack LTE equipment

#TBT: Sprint ditches Clearwire; Google unveils Android … this week in 2007


Editor’s Note: RCR Wireless News goes all in for “Throwback Thursdays,” tapping into our archives to resuscitate the top headlines from the past. Fire up the time machine, put on the sepia-tinted shades, set the date for #TBT and enjoy the memories!


WiMAX marriage on the rocks: Sprint Nextel, Clearwire re-evaluating network plans

With the launch of WiMAX trial markets just weeks away, Sprint Nextel Corp. says it is re-examining its WiMAX business plans and has abandoned a partnership with Clearwire Corp. intended to promote a faster, cheaper deployment of the mobile broadband technology. Sprint Nextel said the decision late last week to terminate a letter of intent with Clearwire signed in July was mutual, as “the two companies could not resolve complexities associated with the [letter of intent]and failed to reach final agreement on the terms of the transaction.” The letter outlined a grand plan for national deployment of a WiMAX network, with Sprint Nextel footing the bill to cover 70 million potential customers and Clearwire covering 30 million pops by the end of next year. With the departure of former Sprint Nextel CEO Gary Forsee, Sprint Nextel’s WiMAX plans had been in question; the company’s acting CEO, Paul Saleh, has emphasized simplifying the carrier’s business and making further commitment to customer care in order to try to reverse the wireless carrier’s customer losses. … Read More


Sprint Nextel stands behind WiMAX plans

Sprint Nextel Corp. remains committed to its WiMAX plans and continues to move forward with its soft launch of services in Chicago, Baltimore and Washington, D.C., later this year, according to Sprint Nextel Xohm public-relations spokesman John Polivka. “We don’t expect any impact to the broad WiMAX ecosystem,” Polivka said in an e-mail to RCR Wireless News. … Read More


Freedom of choice: Google’s plans open door for innovation, confusion

Like Daryl Hannah in “Blade Runner,” Google Inc. last week showcased an attention-grabbing Android. But while the Internet giant garnered headlines and wowed fanboys with its latest move in wireless, some developers reacted with a big yawn. Google ended weeks of speculation about its mobile plans, unveiling an alliance of industry heavyweights centered on a new, open source mobile software platform. The company joined Qualcomm Inc., Motorola Inc. and other members of the new Open Handset Alliance (OHA) to introduce Android, a Linux-based software stack that consists of an operating system, middleware, a user interface and applications. … Read More


Push-to-talk services target Chinese businesses: Kodiak snares contract for industrial region

China Mobile Ltd. subsidiary Jiangsu Mobile Communications Co. Ltd. picked Texas-based Kodiak Networks to supply push-to-talk technology for deployment in the coastal Jiangsu Province. Kodiak said it has been in trials with JMCC with a user base of 20,000 customers who will be rolled over into the commercial launch. JMCC intends to target enterprise users with the PTT technology; the company has more than 12 million customers in the province. Kodiak has more than a dozen deployments around the world with carriers including AT&T Mobility and Alltel. Other markets include the Caribbean, Europe and two networks in India. John Vice, president and CEO of Kodiak, said the company also has “a number of other deals right now that we expect to launch in the not-too-distant future.” … Read More


FCC to enforce 50% hearing-aid mandate beginning next year: iPhone gains controversial exemption

While mobile phone carriers and manufacturers face a key hearing-aid compatibility deadline in early 2008, Apple’s Inc. wildly popular iPhone will get a pass on a major government disability access mandate that wireless companies already have spent significant resources to meet. The situation does not sit well with the Hearing Loss Association of America, which alleged in an informal complaint that the iPhone is not hearing-aid compatible. “There were high expectations from Apple as an innovator of cool technology and because of their past record with screen readers. There was all the secrecy and hype [in the lead up to the iPhone launch]. So there was disappointment when it was released and found to be inaccessible to people with vision and hearing loss,” said Brenda Battat, associate executive director of HLAA and a driving force since the mid-1990s to get cellphones covered by the Hearing Aid Compatibility Act of 1988 and disability access requirements of the 1996 telecom act. The FCC finally agreed to require mobile phone hearing-aid compatibility in 2003. … Read More


Cities unwired: Muni Wi-Fi plans remain in limbo

Silicon Valley – the country’s hub of innovation and technology-is home to more than 2.4 million people and a group of businesses that read like a who’s who of the dotcom darlings. Yet, for all the money and societal changes that were born from the area, there’s still no region-wide high-speed wireless Internet coverage using Wi-Fi technology to be found. Sure, there are plenty of small-scale networks that serve the populations living within range-Google Inc. has a municipal Wi-Fi network that covers 12 square miles in its home base of Mountain View, Calif.-but nothing covers the entire landscape with ubiquitous coverage of this type. Despite the relatively quick freefall the municipal Wi-Fi movement has experienced the past couple months; plenty of cities and other agencies in Silicon Valley are still pushing ahead. All is not lost, they say. … Read More


FCC approves AT&T Mobility/Dobson deal

The Federal Communications Commission approved AT&T’s Mobility’s $2.8 billion purchase of Dobson Communications Corp., embracing less stringent divestiture requirements than those imposed by Justice Department and the same universal service wireless-cap condition federal regulators worked into the $27.5 billion acquisition of Alltel Corp. by two private-equity firms. AT&T Mobility, the largest U.S. mobile phone carrier, is now clear to pick up many of Dobson’s 1.6 million subscribers in rural markets throughout the country. However, as a result of government conditions on the deal, AT&T Mobility will have to sell wireless assets in a handful of rural markets and forgo rights to the Cellular One brand in two markets in Pennsylvania and Texas. AT&T Mobility is also subject to a an interim cap on universal service rural wireless support, a controversial condition overlaid on the Alltel-private equity transaction that can be waived if certain universal service reporting and enhanced 911 requirements are met. … Read More


700 MHz band to be used for broadband worldwide

The United States teamed with neighboring countries to get the 700 MHz band identified for wireless broadband services in the Americas and major markets in Asia at the close of the World Radiocommunication Conference in Geneva, effectively setting the foundation for a global market for WiMAX services and products in frequencies being relinquished in various timeframes by broadcasters around the globe. “This conference has helped create a much larger market for wireless broadband technologies and services,” said Ambassador Richard Russell, head of the U.S. delegation and a top official in the White House Office of Technology and Policy. “Because we know have a very broad swath of spectrum available around the world both on a global and regional basis for wireless broadband technologies, the market for these technologies and services has been enhanced. There is much more certainty today than there was before the conference started [on Oct. 22].” … Read More


LTE gains steam: Nokia, LG, Alcatel-Lucent tests set stage for commercial deployments

Over the past week, a wide breadth of telecom companies have completed Long Term Evolution tests. Nokia Corp. announced results last week from the first phase of a trial that the company claimed achieved 100 megabit-per-second data transfer speeds. The trial was conducted by the Long Term Evolution/System Architecture Evolution Trial Initiative (LTSI), which was founded by a variety of infrastructure vendors, handset manufacturers and wireless operators. The initiative is slated for three phases: proof of concept, interoperability and trial. Testing and reporting will continue through 2009 with initial deployments planned for 2010. The technology is being standardized by the Third Generation Partnership Project (3GPP). … Read More


A changing tide? Ovi, Android loosen carriers

The wireless industry usually teems with laugh-inducing sniping and enjoyable acrimony. But last week, it was all about the love. The mobile space in the past couple of years has become an “us vs. them” showdown as entrenched carriers struggle with the rise of off-deck application developers and other third-party players. In the past few days, though, the world of wireless has been more harmonious than a Beach Boys reunion. Nokia Corp. surprised onlookers when it bagged a huge win for Ovi, its direct-to-consumer uber-service. Ovi had already been the source of contention for some carriers, but Vodafone Group plc-one of the world’s largest and most influential network operators-said it will make the brand’s wide-ranging offerings available directly to its users. Sony Ericsson was quick to follow Nokia’s lead, stating that it is looking to partner with wireless service providers as it expands its off-deck PlayNow business. … Read More


Check out RCR Wireless News’ Archives for more stories from the past.


The post #TBT: Sprint ditches Clearwire; Google unveils Android … this week in 2007 appeared first on RCR Wireless News.




Read more…: #TBT: Sprint ditches Clearwire; Google unveils Android … this week in 2007



#TBT: Sprint ditches Clearwire; Google unveils Android … this week in 2007