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 [MMC 401] C.O./PBX Line
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 Used to select the mode of the CO line.
 If the PBX mode is chosen, this allows 
 PBX access codes to be recognized, 
 thus allowing more complete toll 
 restriction. This mode is assigned on
 a per-trunk basis. If a trunk requires
 the use of RECALL key, it must be set
 to PBX mode.

 ** mode : CO // PBX