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Unread 02-05-2008, 10:36 AM   #1
Grahame
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Default 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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Unread 02-05-2008, 12:07 PM   #2
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I suppose this issue is not related to NAT directly.
Just try to change DTMF settings (rfc2833 vs SIP INFO) on your side and check the result.
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Unread 02-05-2008, 07:47 PM   #3
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Thanks for the reply.

I'm set on my side to RFC 2833 ( default ). The only changes I can make are to PCM or SIP INFO.

Did you mean change to SIP INFO ?

Grahame
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Unread 02-06-2008, 02:28 AM   #4
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yeah, try changing those DTMF settings to one of the other two when you have the audio optimized; it might work better

Update: I imagine it could be anything. It would take a network engineer and a fat wallet to ever truly get to the bottom of various bugs in the system. Glad to see it was easily resolved.

Last edited by ctylor; 02-07-2008 at 01:21 AM.
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Unread 02-06-2008, 10:11 AM   #5
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I have reset Symmetric NAT to No and Voice Optimisation to Yes.

I have tried DTMF as PCM or SIP INFO on my ATA ( ZyXel P2002L ) and IVR calls work fine using either.

Why this should work and RFC 2833 does not I have no idea.

Many thanks for your help

Best regards

Grahame
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