Hi' this is a condition code, from Alex bc9:
Condition code (type of call that consists of one letter):
( ) Outgoing call
(A) Call handled by PABX operator
(D) Extremely long call duration
(G) Call has been connected with alternative route selection
(H) Recall to route
(I) Incoming call or tandem call
(J) Internal call
(L) Conference call
(M) Least cost routing
(N) Dialled party not equal to answering party
(Q) Malicious Call Trace
(R) Intrusion
(T) Transfer call
(V) Data call
(W) Call terminated due to route optimization
(X) External follow me
(Y) Call established due to route optimization
(Z) DISA call
Condition code (type of call that consists of two letters)
(VJ) Internal data call
(VI) Incoming data call
(VO) Outgoing data call
(DO) Long outgoing call
(DA) Long PABX operator extended call
(DI) Long incoming call
(DJ) Long internal call
(DV) Long data call
(DX) Long external follow me
(NJ) Dialled party is not the answering party on an internal call.
(NI) Incoming DID call when the answering party was not the dialled party.
(CI) Abandoned non-DISA call
(CZ) Abandoned DISA call
Condition code (type of call that consists of three letters)
(NCI) Abandoned non-DISA call, dialled party is not the answering party.
(NCZ) Abandoned DISA call, dialled party is not the answering party.