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An Introduction to Voice Over IP ( VoIP ) with Biamp

BIAMP
Biamp Systems has had a VoIP solution for use in audio conferencing systems for over 2 years now – this technology isn’t new to us. In the past two years, AVI-SPL has installed our solution in systems that are integrated with Cisco Call Manager 5.0 & higher, as well as SIP systems by Avaya, Shoretel and others.

What is VoIP?

Internet Protocol (IP) is the way you can digitally access and send information from a network. You communicate using IP every time you access the internet. Now you can leverage that in new and cost-effective ways. From audio to control to video, IP enabled products are the future backbone for A/V systems. Lower costs, greater flexibility and better management are all advantages of leveraging existing IT infrastructures. With the introduction of the VoIP-2 card, a SIP compliant two-channel Voice over Internet Protocol interface, Biamp Systems follows our tradition of innovating to better serve our customers.

The VoIP-2 Card allows Biamp’s AudiaFLEX to connect directly to IP-based phone systems. Used in conjunction with AEC-2HD Acoustic Echo Cancellation Cards and TI-2 Telephone Interface Cards, the VoIP-2 Card makes AudiaFLEX the most powerful, flexible and affordable telephone conferencing product available. Up to six VoIP-2 Cards can be installed into a single AudiaFLEX unit.

VoIP Basics

Before diving into technical details, this simple overview diagram is a good start to summarize steps involved in a VoIP call.

1. The voice signal is first encoded into a known compressed audio format, packetized in a real-time protocol and then transmitted over the network.

2. A VoIP protocol takes care of managing the communication session.

3. On the receiving side, data is extracted from packets and the signal is decoded back to analog audio. Success of this process is obviously sensitive to delay and packet loss.

Into into VoIP

What Are Those Voice Over IP Acronyms?

Voice over Internet Protocol (VoIP): Protocol specifically designed for voice transmission over networks (LAN/WAN).

Protocol: Similar to how a language enables communication between people, a protocol defines a set of rules used to control connection, communication and data traffic between different network devices.

Codec: It refers to the software algorithm used to encode the voice signal into a compressed data format optimized for transmission over IP. On the receiving side, signal is decoded back to analog audio. Codec quality obviously affects audio performance.

Session Initiation Protocol (SIP): SIP is a widely used peer-to-peer protocol that allows the set up, modification and tear down of a VoIP communication session. Peers of a SIP session are the User Agent Client (Initiating the call) and User Agent Server (Answering the call). Note that SIP does not handle voice transmission, it only manages the communication.

SIP servers: They include the Proxy, Redirect and Registrar Servers. Their purpose is to provide name resolution, user location and pass on messages to other servers in the network.

SIP addresses: Users in a SIP network are identified by unique SIP addresses. A SIP address is similar to an e-mail address and may be of two types: a user name (sip:support@biamp.com) or an E.164 address (5036417287). VoIP-2 card only supports E.164 address.

Real-time Transport Protocol (RTP): An IP packet format that is used for delivering real time audio/video over the LAN/WAN. Once the VoIP call session initialized by SIP, RTP is the protocol used to transmit the voice data.

Quality of Service (QoS): Mechanism used to prioritize applications, users, data flow by guaranteeing a certain level of performance. QoS is very important in the case of RTP applications such as VoIP where it is used to insure quality of the audio signal.

Domain Name System (DNS): DNS procedures provide translation from human friendly hostnames into IP addresses. The SIP session mainly uses DNS to allow a client to resolve a SIP URI into the IP address, port and transport protocol.

SIP call flow process: During the registration process, SIP devices register to a registrar server their SIP addresses. The network is then aware of the location of a device upon request. When a user initiates a call, the SIP discovery process starts by sending a request to a SIP server (proxy or redirect server). The challenge for the proxy server is to obtain the IP address of the device such that voice data can be routed between them. Negotiating a compatible data format (sample rate, codec …etc) is the next step before voice data can be transmitted between parties. SIP terminates the call session with a BYE message at the end of the call.

Click for featured BIAMP products »

AMX’s New Partnerships Provide Building Energy Consumption Savings and more.

AMX logoAMX’s partnership with FieldServer Technologies and DENT Instruments will offer an integrated building management control system for building automation, AV devices, and indoor environmental quality from a single interface. This allows all systems to follow a base set of rules for reduced energy consumption to lower carbon footprints and contribute to LEED points.

Click here to read the complete article »

Would you like to know more about AMX products? Click here to request more information »

SANYO’s All-in-One Projector Mounts Provide the Full Power of Audio

Sanyo logoTargeted for the educational market, SANYO’s new MT-EDU 101 and MT-EDU 102 projector mounts offer an all-in-one package for teachers on a budget. They deliver the impact of 50-watt two-channel amplifiers and two powerful 25-watt rated two-way speakers for high-performance capabilities. This effectively eliminates the need to use a typical projector’s internal speakers or a separate audio system in order to gain the same effect.

The high-efficiency ported speakers, which use 5” woofers and directional tweeters, are tuned to provide optimal sound coverage in large rooms, including a standard 32’ x 32’ classroom. Designed to avoid overwhelming listeners in the front rows with excessive sound levels, the system provides excellent intelligibility throughout the room without distortion and microphone feedback.

Multiple external audio sources, including wired and wireless microphones, are easily accommodated without complicated wiring arrangements. A line level microphone jack, two sets of stereo RCA inputs and a mini stereo jack are located on the side of the mount chassis, and each input has an individual gain preset control.

MT-EDU101 Mount

For short throws, the MT-EDU101 extends 7 to 27 inches from the wall, and for longer throw distances, the otherwise identical MT-EDU102 adds an extension pole to place the projector 37 to 67 inches from the wall. These can be mounted either to single or dual studs on 16”, 18”, or 24” spacing, and can also be mounted to concrete.

A universal projector mounting mechanism allows the mount to be used with any short-throw projector, including the SANYO PDG-DWL100, PDG-DXL100, and PLC-WXL46 projectors. It provides a pitch adjustment of ±16.5º, a 7.5º roll adjustment, and a 41º yaw trim. Total weight capacity for the mounts is 50 lbs.

An integral cable routing system allows concealed management of signal and power cables, which pass from the projector through the arm and into the wall mount. Security for mounting of additional AV equipment such as PC, Mac or control modules is available by using additional security hardware that fastens to the wall mount.

Click here for a list of featured Sanyo projectors »

SMART Boards Prove Effective for Academy at the Farm’s Inclusive Curriculum

“We thought the teachers would really love it. Well, the problem is that they did!” — Ray Polk, Instructional Technology Coordinator, Academy at the Farm

Based in Dade City, Fla., Academy at the Farm is a unique K-8 charter school that serves nearly 400 students a year. Today, this A-rated school features SMART’s 680i interactive white boards and Elmo document cameras in nearly every classroom. “This technology has helped increased our kids’ enthusiasm, as well as that of our teachers,” says Director Mike Rom.

A Dramatic Difference
The SMART Notebook software has proven invaluable to the Academy teachers, from watching eager kindergartners perfect their penmanship to using the innovative programs to increase algebra skills among eighth graders. The school has also improved overall communications, using the SMART Boards to stream morning and afternoon announcements, and even have their students conduct live chats with Congresswoman Ginny Brown-Waite.

Tell us, how has SMART Technology helped improve the level of excitement and interactivity at your school?

Meet the Control Room Group

By David Jones, Sales Manager Control Room Group

The Control Room Group (AKA the CRG) is a business unit of AVI-SPL. Created in 2002 by current CRG Vice President Sean LaNeve, the CRG works exclusively in the mission critical control room market space.

We design, integrate, install and support full spectrum command and control facilities. Our client list includes the United States Military, the Florida Department of Transportation, Bank of America and Nevada Power.

US Central Command

As we say at the CRG, there is no “one size fits all” control room design. We specialize in customized solutions for our clients. This requires strategic partnerships with the manufacturers of products used in the modern control room, including video cube technology, flat panel displays, human machine interface (HMI) systems and video processing technology.

The CRG is composed of teams that focus solely on one of four vertical markets:

  • Government
  • Utilities & Process Control
  • Transportation
  • Corporate (Network and Security Operations Centers)

The CRG teams are experts in their markets. They speak the language of the control room and understand the nuances of control center operations. But most importantly, they are familiar with the system designs that best address the day-to-day issues and opportunities that arise in each vertical market.

Our Utilities & Process Control team alone has more than 60 years of direct experience in the electric utility industry. The team has successfully completed more than 35 control room projects that range from small cooperatives to the largest Investor Owned Utilities in North America. All of our vertical teams have similar success and service records. It is our industry-specific structure and focus that makes the CRG a unique and valued strategic partner to our clients.

Meet David Jones My intent is to keep this blog as current and informative as possible. Our industry expertise enables us to provide you with statistical and anecdotal information about all aspects of the mission critical control room market.

Please don’t hesitate to give us your feedback – questions, comments or critiques. We welcome the opportunity to talk with you.

Learn more about the Control Room Group