If you are on a PBX, you may need to press a digit to get an outside line (i.e. 9). In this case you would enter 9,,,16175551212.

In order to forward incoming regular calls to a VoIP call, such as through SkypeOut™ or to a Skype account, enter speed dial number (e.g. 77) associated with the Skype User without the * key (as shown above).or enter the SkypeOut™ number (e.g. 0016175551212).

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D-Link DPH-50U manual