CM6 inserting a 9 on calling number

[y2ger]

I have a Nortel CS1K connected to Session Manager via SIP trunks. Any outbound calls to the PSTN go through our CM6 system also connected to SM via SIP trunks. When an outside call is made from a CS1K phone, the CS1K is sending the calling number (123-456-7890) to be used since I can not control this in CM using the Public Unknown table. In CM, I am inserting a 9 in the Incoming Trunk treatment table for the SIP trunk to allow ARS to route the calls out through the PRIs on our G450s. The calls are routed out to the PSTN correctly but for some reason, a 9 is also inserted in the calling number so the caller ID comes across as 912-345-67890.

When I dial from a CM phone, I can control the calling number and that goes out correctly, this only happens when an outbound call comes in from the CS1K system. Also, there are no PSTN trunks on the CS1K system so all outbound calls go throgh CM6. Avaya is telling me it's a configuration issue. Has anyone seen this behavior before? Here's a copy of a trace showing this:

18:34:06 dial 915622222222 route:ARS
18:34:06 term trunk-group 13 cid 0xad8
18:34:06 dial 915622222222 route:ARS
18:34:06 route-pattern 102 preference 1 location 1/ALL cid 0xad8
18:34:06 seize trunk-group 13 member 75 cid 0xad8
18:34:06 Setup digits 15622222222
18:34:06 Calling Number & Name 91234567890 NO-CPName

 

[PBXHowTo]

What does your PUB table look like for this entry?

What is your session manager sending in the expression across to the CM?