[cisco-voip] Incorrectly switch to modem passthrough mid-call

[Glen Cobby]

Hi

I had a similar issue a few years back. It was a 2100hz guitar strum causing the gateway to believe it was a fax tone. I had to use audacity to change the particular tone slightly and the problem went away.
Like yourself it took a while to get to the bottom of the issue!

Thanks

Glen

On 8 Jun 2011, at 17:18, <James.Brown at barclayswealth.com> wrote:

> All,
> 
> I've noticed recently that around 1 in 10k calls arriving into our Contact Centre appear to change codec half way through the call. After many hours of Wireshark analysis, I realised the gateway was incorrectly detecting certain sounds from the client as SG3 fax and consequently upspeeding. To the human ear, these are obviously not faxes, so I raised a TAC case, thinking I might have come across a DSPWare issue.
> 
> The TAC response is that this is normal. I wanted to gauge opinion on this one, because I have honestly not come across it before. Has anyone else experienced voice calls incorrectly converting to fax mid-call? Presumably this also has implications for the recently added T38 support for SG3, because our agents aren't trained to speak that yet ;-)
> 
> Regards
> 
> James.
> 
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