Double digits problem with at&t U-verse [telecom]

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Double digits

With AT&T U-verse voice, I'm experiencing what I call a "double digits" problem. When I dial an 800 number automated service, such as my bank or conference call bridge, and enter my PIN digits, the host is recognizing duplicate digits. Example: if my PIN is 123, the host recognizes "112233". This has been an intermittent problem over the past several weeks. I've rebooted my gateway, used different handsets, and connected the handset directly to the gateway (eliminating the house wiring). I've contacted U-verse support, but they have been unable to diagnose the problem. Does anyone have any suggestions? Internet service is operating normally. I do not have U-verse TV service.

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(I suggest any replies be copied to the DSLREPORTS forum)