Audio over IP and Voice over IP converge !
icon4 09 2nd, 2008| icon3Comments Off on Audio over IP and Voice over IP converge !

As you probably have seen, Barix is supporting SIP since about 15 months now. A complete SIP stack and application, which is provided in source form, is in the Barix ABCL kit.

While requirements for an Audio over IP and a Voice over IP (VoIP) system are typically quite different, the Barix solution can serve both!

The SIP application can be used for emergency call posts on Annuncicoms (full duplex communication, initiated by a button press from a user), but also for output only applications, such as Paging speakers or interfaces to existing PA systems. In that case, the application supports multicast and also Auto Answer.

For use in Parking Systems or door access control, the built-in relay of an Annuncicom can be controlled via SIP Info.

So – where comes Audio over IP in place ?

Supporting MP3, AACplus, Ogg Vorbis and WMA (select hardware), the devices provide excellent capabilities for IP Audio distribution.

We are working on integrating both the Audio and Intercom/Voice/Paging functionality into one single application, when available, this will allow you to
do IP Audio distribution in high quality (for example, in Hotels, Cruise ships etc), yet, at the same time, have the device register as a VoIP “phone extension” on an IP based phone system.

For the Audio over IP functionality, the high quality music encoding can be used, and the devices automatically switch over to VoIP codecs when such functionality is required.

An alternative is to use one Barix device as a SIP gateway, allowing easy paging zone selection via “DTMF” (actually, SIP Info): The advantage here is that only one extension is used, which could save license cost on the PBX, and also enable synchronous paging on multiple devices via Multicast, which is not supported by many VoIP PBX’es so far.

A third option, available now, is the use of Bell Commander from Acrovista , a partner. It provides the same functionality on a PC, with an extensive Bell Scheduling and PC based Paging solution.

If you have an application where you need to deliver an RTP stream to multiple devices and your network infrastructure or source does not support Multicast, the Barix RTP replicator software may be the right thing for you.
Intended for Barix Audio over IP solutions, but useable with about any device or application or data, this software runs on either a Barionet or an Annuncicom, receives audio on a socket, and distributes the RTP packets to a list of up to 100 destination address/port numbers. You can also send to broadcast or multicast addresses.

Run on the Barionet, the application can easily forward a 100kbps IP Audio stream at 30-50 blocks per second to more than 100 destinations, with a delay of less than 20ms ! Using Barix hardware for this purpose has a lot of benefits: PC-Free technology, well below 4W power consumption, no moving parts, no themral issues, operational within 5 seconds of power up.

Customers of Barix use that solution since years to generate thousands of RTP streams to distribute IP Audio streams in real time.

.. and if you need to broadcast RTP in a “remote” network, the solution can be used as well … just configure only one target, the broadcast address, install the device in the remote location, and stream RTP to its receiving port. The RTP stream will be rebroadcasted in the destination network (multicast supported too, of course).

Questions ? Contact us !

Central solution for a large IP intercom system?
icon4 08 22nd, 2008| icon3Comments Off on Central solution for a large IP intercom system?

Barix devices can be perfectly used for IP intercom and emergency call post purposes. Our free ICGraph application (download from the website) can serve well for a PC based central solution, and we also offer a hardware console now (made by our OEM, MS Neumann Elektronik, who builds fully certified evacuation and industrial/oil and gas intercom systems using our IPAM IP Audio module).

However, what do you do if you need to handle potentially hundreds or thousands of call stations ?

Well – our SIP firmware comes to the rescue ! It can be used on all our IP Audio devices and makes them compliant to the standard SIP functionality – but with a twist: the source code is open, so you can add special behavior to the devices (and we can also do for you !)

As the central management software/solution, you can use any SIP based PBX, such as (free) Asterisk. You can typically configure hunt groups, queues, nighttime calling plans etc in a PBX easily, and use standard IP phones as consoles. Why re-invent the wheel if this is all available?

Of course, you can monitor the whole system independently from the PBX, add emergency capabilities (“all call” without the use of the PBX), background music etc.

We are happy to help planning such a solution – applications are numerous, being it an IP based nurse call system, highway emergency call boxes, a PA and intercom system for public transport … or an IP Audio entertainment and communications system for a cruise ship.


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