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DTMF tones in call forwarded to cell phone or landline


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We got report from several customers using PBXnSIP that when they set up call forwarding on the extension to the cell phone or landline number, they could hear DTMF tones in the incoming call forwarded by the PBXnSIP to their cell phone or landline number. We tested it and couldn't reproduce the same problem. Have you heard such problem before?

Thank you,



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