# Default RCOS

The default RCOS is RCOS 1; it is unnamed and allows unrestricted outdial capabilities. The RCOS 1 contents are summarized in the table below. To implement NPA/NXX call screening, you must modify RCOS 1 or configure another RCOS. RCOS configuration involves setting both system-wide parameters and RCOS-specific parameters.

Contents of Default RCOS 1
Parameter | Value
Starting digit position of NPA Ending digit position of NPA Starting digit position of NXX Ending digit position of NXX Home NPA Check/do not check numbers without absorb digits Absorption digit patterns Exact match numbers Exact match number patterns NPA screening NXX screening | 0 0 0 0 None Do not check None Disallow None Disallow Disallow