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Dialing AC1 blocked across PRI

Dialing AC1 blocked across PRI

(OP)
I have a CME PBX tail hanging off a CS1000 7.6 system and when the tail PBX dials the AC1 (9) they are immediately presented with fast busy tone. I turned on DCH monitoring and I can see the 9 come across the DCH on the main CS1000 PBX. I checked the PRI route but cant figure out what is wrong. A work around I have discovered is to change the ACOD on the CS1000 route to "89" which allowed the CME to access the outbound PRI on the CS1000. I would much rather have the tail PBX dialing 9 as the CS1000 does to access the outbound trunks, but again I cant figure out what is wrong or if it can be done. Please advise Thank you

RE: Dialing AC1 blocked across PRI

(OP)
Hi Firebird, I don't think its an SPN,NPA,NXX issue as I get a fast busy as soon as I dial the AC1 "9".

RE: Dialing AC1 blocked across PRI

Have you verified that the NCOS on your trunks connecting the two allow you to make the call?

RE: Dialing AC1 blocked across PRI

(OP)
NCOS has been checked, somebody mentioned it could be either the FTOP setting under the NET_DATA block, or the OVLR/OVLS setting on the DCH. Does this make sense?

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