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mike at jerris.com
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 Posted: Thu Nov 06, 2008 10:26 am Post subject: [Freeswitch-users] Inband DTMF Problem |
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On Nov 6, 2008, at 10:08 AM, Klaus Teller wrote:
| Quote: | OK. I updated and tried flushing the DTMFs before playing the
commands and it works. Thanks.
Now, i feel there is a more general issue of scalability around DTMF
(both inband as well as RFC2833) handling in Freeswitch. What do you
guys think?
What i've been working on is a tool for testing voice applications.
The tool connects via Freeswitch to the voice platform and simulates
the behavior of the user. We've tried the tool with the most
reliable voice platforms out there as well as with some less reliable.
What we observe is that in all cases, we can run 100 calls
sequentially without problem. But as soon as we have 10 calls in
parallel, digits start to get lost. Is this something you think
should be expected?
I must note that there are a lot of DTMF reading and sending going
on. In fact, the testing tool doesn't use voice recognition to
assert whether the voice application is in the right state or not.
Instead, we instrument the voice application to emit some DTMF
sequences that are uniquely mapped to prompts. So there DTMF
sequences are read by the testing tool to determine if the voice app
is in the right state or not.
Looking forward to your feedback.
Klaus.
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You should have no expectation whatsoever that inband dtmf will ever
scale, as for rfc2833, I tend to doubt that there is any scaling
issues there. Do you have any traces and accompanying freeswitch
debug logs that show this behavior? Is it reliably reproducible?
Mike
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