September 2011 Archives

Why an IP-centric telephony board is the best choice when building highly scalable or resilient solutions

September 30, 2011 11:34 AM | 0 Comments
This is part two of a set of articles describing the benefits of Aculab’s range of IP-centric Prosody X media processing boards for developers of large scale communications platforms.
In part one, it was stated that there are many advantages in having IP at the core of the Prosody X media processing board, not least of which is the high channel counts made possible by such an architecture. But that is just one aspect…

Choosing IP connectivity enables a distributed architecture

In putting IP technology at the heart of the Prosody X design it is much simpler, due to the ubiquity of Ethernet in IT networks, to build multi-board, multi-chassis and multi-location systems using Prosody X. So if the high channel counts of a single Prosody X board are not enough, then it is easy to build multi-board systems.

The traditional way

Before VoIP entered the telephony world, we depended on TDM technology and an array of disparate CAS and CCS type PSTN protocols, and most of the voice-based solutions had a common architecture, simply described as a host server with telephony boards.

Continue Reading...

Dealing with RTP loss

September 14, 2011 10:11 AM | 0 Comments
In my last post, you read about SIP call recovery from RTP loss. This post continues the theme, providing some more useful information – detecting and dealing with RTP loss between two SIP end points.

If you recall the scenario, there is a gateway installed between an SS7 carrier network and an emergency services IP network – an ESInet – over which emergency calls are routed to public safety answering points (PSAPs). Calls entering the ESInet via the gateway are SIP/RTP/UDP and, as the NENA i3 specification quite rightly states, in no circumstances should an in-progress emergency call be taken down automatically, just because RTP streams fail.

Whatever effort you put into making the call handling equipment redundant and resilient, it is always best to assume that bad things can still happen. To misappropriate the principle of simplicity from Ockham’s razor, follow the rule of thumb that advises, “Make as few assumptions as possible.” In fact, make one assumption only – expect the worst (i.e., ‘the proverbial’ happens).

So, we can expect situations to arise in which RTP media between the gateway and the ESInet fails.

PSAP equipment must be able to distinguish between RTP failure and real silence by a caller. Continue Reading...

New high density Prosody X PCIe media processing board hits the sweet spot for developers

September 12, 2011 10:51 AM | 0 Comments
Vanilla cupcake topped with strawberry ganache www.thesweetkitchen.co.ukOur clever engineers have done it again – you’ve now got an even higher density, media processing board with which to play. The new PCIe board joins the Prosody X family of DSP-based boards that are used extensively in multimodal communications systems.

We could have just taken the existing 4-trunk Prosody X PCIe board and added further trunks and DSPs. Instead we took note of customer feedback and went the extra mile to further improve the original design. 

The result is a board with vastly increased channel capacities, giving our developer customers the components needed to readily craft large scale systems at a very cost-effective price-per-channel. Whilst many DSP boards top out at 240 channels, the new 8-port Prosody X PCIe board can support up to 720 channels.
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Who owns the cloud?

September 8, 2011 10:16 AM | 0 Comments
If the thought of storing critical, personal or sensitive information in a place that to all intents and purposes is completely out of your control makes you feel a tad uneasy – you’re not alone.  Using the cloud, particularly in relation to data, is a bone of contention, but there are options for you to choose from, each with its own merits.
A previous blog post introduced the idea that services (IaaS, PaaS and CaaS) can be deployed in three different types of cloud - private, public or hybrid (there are more variations out there, but those are the key ones for you to consider at this early stage).  Which is the best option for you, really depends on what you’re looking to achieve.  It may be useful to think about your top priorities, for example, ‘risk aversion’ or ‘cost reduction’?
It’s virtually your choice
What’s the key factor that sets cloud categories apart?
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SIP call recovery in gateways

September 2, 2011 11:08 AM | 0 Comments
Life is full of truisms; those self-evident truths in statements like not being able to recover your lost youth (despite what plastic surgeons say – or any number of elderly film stars have wished). It’s not as evident that you can’t recover SIP (session initiation protocol) calls when they appear to fail. What happens when you lose an already established SIP call between a gateway and an end point on a VoIP (voice over Internet protocol) network? Can it be recovered?
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Why shouldn't you move to the cloud?

September 1, 2011 6:31 AM | 0 Comments

This question, albeit it’s more of a statement seeking endorsement, was recently raised on LinkedIn and it generated a variety of responses relating to security, ease of use, and flexibility, to name but a few. I couldn’t resist the temptation to respond and counter some of those ‘issues’.

Security – any computer connected to the Internet is at risk from hackers, whether it is in the cloud or in a private data centre. Would it be true to say that an SME, with necessarily limited resources, is able to better secure its data than say, Amazon?

In addition, who says everything needs to be in the cloud? Adopting a cloud computing strategy isn’t an ‘all or nothing’ decision.

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