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It is a trunk-side switch connection.

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Posted by waqqas1

Feature Group B - associated with 950-XXXX calling; instead of a local telephone number the user enters 950 and 4 additional digits; depending on the service provided this may be followed by a calling card number and the long-distance number.

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Posted by sagitraz

Feature group B (FGB) is a trunk-side switch connection that is accomplished via an access tandem.

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Posted by rubanroy