atcomsystems.ca/forum Forums TDM Business Telephone Systems Avaya - Lucent Telephones & Systems Partner total extensions on same line

I have a customer with a Partner ACS (R6 I believe). A couple times a week several people in the office call into the same conference bridge independently from their own offices/extensions. They only have 4 CO lines but often need more then that so they discovered that one person could initiate the call and the others could hop on the same active CO line to "join" the conference. They do not have automatic extension privacy active and are ok with that. They discovered that only 3 total people can get on the same CO line. Is there a system setting that I can change to increase that? If not then they can just use another CO line and call in.