Unable to use DTMF whit SIP Phones

Unanswered Question
Jul 26th, 2010

Hello


I have an UC520 and SIP IP Phones, the problem is when I try to dial on Auto Atendat, for example I calling to the bank and when I try to selec one option (Press 1 to sales) does nothing. the same occurrs when I dial to VoiceMail And introduce the password the operator says Unknown Option.

Any Idea for it.

Regards.

Attached the configration.

Attachment: 
I have this problem too.
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