Thank you all for your responses, now here's the scoop:
- The RAM cartridge is an NTBB08GA-93 03 so I believe it's a release 3
- The software version is SP:30DEC04 NAT which I believe is 7.0
- They have constant problems with dropped calls. Also, when they go to dial out they get a fast busy after dialing, or sometimes after only dialing 4 or 5 numbers. When this happens, the display just goes blank when it gives the fast busy. When it happens while dialing, it shows the numbers they have dialed, but the screen will just suddenly go blank and give the fast busy. And it has happened to me, so I know it's not user error

- The errors in the logs are EVT327-00 S5, EVT327-01 S5, EVT336-00 S5, EVT330-01 S5, EVT329-01 S5, EVT328-01 S5, EVT327-01 S5, EVT336-01 S5, ALM:44-0, ALM:44-1, ALM:41-0, ALM:42-0. All of these were with 3 minutes of each other the day before yesterday. There is nothing from yesterday, but they did say it was happening a lot yesterday.
Believe me, I totally think it's the telco too. I have explained to the customer that we have over 400 customers here in Las Vegas who's phone systems we service, and these problems are almost always telco related. These problems have been ongoing for almost 6 months now, and as I said before, we've replaced the T1 card, the software, and the RAM cartridge, so there's really nothing left to replace but the phone system cabinet (except for the 6-port combo card, could that be the problem?). We are replacing the phone system at the customer's expense, assuming the problems continue (which I'm pretty sure they will). If it turns out it is the phone system, we're going to take care of it.
Again, thank you all for your help. It's always appreciated! Drinks are on me next time any of you are in Vegas
