I have an old Avaya G3R Definity system with V6 software..I have worked on Avaya products since 1994 and this is the first time I have ever encountered this problem.. The INADS port is not answering.. It appears to pick up but drops the call. I have replaced the maintenance card and checked the Aux cable to make sure it is seated properly. At wits end at this point. Any suggestions? Thank you in advance