[asterisk-users] Odd error mssage on DAHDI lines

[Richard Kenner]

What's this:

    -- Attempting call on DAHDI/g1/9<removed> for application Wait(5) (Retry 1)
    -- Requested transfer capability: 0x00 - SPEECH
    -- Channel 0/2, span 1 got hangup, cause 44
    -- Forcing restart of channel 0/2 on span 1 since channel reported in use
    -- Hungup 'DAHDI/2-1'

Where can I look up "cause 44".  And if this is the sort of transient
error that seems to be implied by the "Forcing restart" message, why
isn't it retried?