The last ver of software for the IVM was 4.01G. And there are fixes for some issues over 4.00J. All of the IVM's are DOS based and Have AVC cards installed in the PC for voice channels. The DVC card is used in the ImaGen voicemail systems. Telrad suggest keeping the voicemail software level the same as the system software level. The 4.00J/4.01G software will work with limited features upto release 6 on the phone system. ***Release 7 Imagen is Windows 95 based and will only operate on win95.***
The problem you are having with delay messages can DTMF receiver issues on the AVC card but more than likely its just a matter of disk clean up. If you have messages that have been deleated and the disk space has not been written over with a new message it is possible that when the system runs scandisk and defrag on sunday you come in on monday and the old messages are there. This doesn't happen often but I have found this. Also in you mailbox id you have message reminder turned on it will re light you MSG light.

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