“We currently have two phone numbers and four AT&T ML17929 phones. Each Phone has one phone wire plug that carries both phone lines to the phone. Will this phone system (base and extensions) work with both phone numbers on one wire?”

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• Pat - The AT&T ML17929 is a stand alone phone and cannot be registered to another telephone system. The CM18245 on the other hand is the extension deskset compatible with the telephone base model CM18445. The Telephone base can register up to 9 extensions. Thank you, -VTech Support

  Answered by VTech Baby Monitors Team 3 years ago

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