If you'll be running commercial apps, I would recommend that you do a lot ofActually, there isn't that much processing power on the Dialogic boards. They have rather limited DSP and MCU resources. That is why they only handle codecs of trivial complexity. The reason they get better high load results for IVRs is they have huge latency, which helps enormously with the response times the applications level code needs to achieve. Such high latency kills phone calls, but nobody notices for IVR use. Most Dialogic cards are incapable of doing anything other than IVR or call switching through their mezzanine buses, as they are not full duplex. Even so, the throughput you can achieve in pure IVR applications is not that great. When you hear of people with a large bunch of T1s or E1s into a Dialogic box, it is normally some limited IVR work plus a lot of call switching. That call switched data passes across the mezzanine bus, and has no impact on the main processor.
testing, especially load testing, with the types of applications you'll be
running. Dialogic boards, although incredibly expensive, do have lots of
horsepower built in for the purposes of encoding and decoding the voice
streams, decoding single and DTMF codes, voice energy and cadence detection,
etc. Digium boards rely 100% on the processor that they run in to perform
these functions. I was a little disappointed to find that I can (so far)
reliably only handle 4 E1's in a (very) high-volume IVR app. In the past
I've run Dialogic-based systems which handled much more load (but also which
cost 4 times as much in hardware!) Although Digium's newer TE410P board is
capable of bus mastering, I found that it made little difference in the
number of channels I could run.
Some of the JCT cards from Dialogic can be set to a lower latency, and are full duplex. This is aimed at TTS + ASR use, rather than VoIP calls. The lowest latency is still much higher than the Digium cards, but even with this the number of channels you can handle reliably is a lot lower than when you use the traditional high latency Dialogic modes.
Dialogic support was great 10 years ago, but is now almost non-existant. Their drivers are buggy, and not keeping up with the times. Their previously active forums seem to be in serious decline. Most of their long term customers find it hard to say nice things about them. They are expensive. On the other hand, they do have broad approvals across the globe. I think that is their biggest asset.
Regards, Steve
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