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

[James.Brown at barclayswealth.com]

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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