it's an internal csu.

although asterisk has the capability to use voip, we're not using it for outbound calling. the pc has a t1 card that the interfaces with the smart jack similar to most digital phone systems from what i understand.

here is a snippet of the latest log. today has been an absolute nightmare as far as the drops go.

100 05/27/2009 10:35 AM NOTICE chan_zap.c: PRI got event: No more alarm (5) on Primary D-channel of span 2
101 05/27/2009 10:35 AM WARNING chan_zap.c: No D-channels available! Using Primary channel 48 as D-channel anyway!
102 05/27/2009 10:35 AM NOTICE chan_zap.c: PRI got event: Alarm (4) on Primary D-channel of span 2
103 05/27/2009 10:35 AM WARNING chan_zap.c: Unable to disable echo cancellation on channel 47
104 05/27/2009 10:35 AM WARNING chan_zap.c: Detected alarm on channel 47: Red Alarm
105 05/27/2009 10:35 AM WARNING chan_zap.c: Unable to disable echo cancellation on channel 46
106 05/27/2009 10:35 AM WARNING chan_zap.c: Detected alarm on channel 46: Red Alarm