IP Office 412 crashing

[crownroyalmopar]

Have a customer with a 412 4.1.15. System has approx 140 single line analog phones and 30 digital. 4 T1's and 30 analog trunks and 20 port VMPro. System is on it's own network.
The customer is a collection agency and they have quite a bit of call volume, installed system approx 18 months ago, replaced a System 25 that had been outgrown but was rock solid in regards to reliability.
The issue that I am having is that when the call volume gets to be about 70 active calls the system starts getting erratic system dialtone, as call volume goes up it gets more erratic and will eventually crash.
Have sent config and trace files to Avaya, and they gave me about 4 small things to change in the config, but nothing that affected my issue.
The IT guy at the customers site thinks that there isn't enough processing speed to handle the call volume, Avaya tells me that is not the case ,but is not providing me with any info to support that statement.
We noticed an issue with "Ringbacks" on system status monitor, we are replacing the single line phones with 6219 phones as Avaya said they have "Positive Disconnect" and will not put calls on hold with the hookflash as the Wally World phones do that they currently have.
Can anyone give me any insight, to my problem, and possibly any solutions. Thank you.

 

[R3LzX]

First question I would ask is the order in which the system was upgraded. Was it upgraded to this release in the correct order?

 

[crownroyalmopar]

Yes it was, we went from 3.2.55 to 4.0.5 shortly after install at Avaya's recommendation, then to 4.1.15, as far as we know we have done everything properly. Avaya's tier 3 engineers have a copy of our config and have told me they are going to run it in the same scenario they have in their lab and see what they can find........stay tuned.

 

[R3LzX]

I have had trouble with legacy lines (ground start T-1-s) what kind of T-1's are they? and if so are they ground start? Some of these old ground start t-1's cant do trunk to trunk transfer and some other things and I just wanted to know what kind of T's they are.