DTMF and Symmetric NAT
Having recently experienced some voice quality problems with a couple of Providers, I followed the post " How to Improve Your Voice Quality ".
I changed my settings as per the post i.e symmetric NAT NO, Optimise Audio YES and indeed call quality did improve.
However, I now find DTMF is not being recognised if I make calls to numbers which require " Press 1 for Sales etc ".
I have changed back to symmetric NAT Yes and Optimise Audio No and all works perfectly.
Why would the NAT setting block DTMF ? Any help gratefully received.
Best regards
Grahame
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