Can VM and AA be added to this system?

Thanks in advice,

yes and yes you can find a kx-tvs 50 dirt cheap hang tvs off analog
ports using inband signaling

https://docs.google.com/viewer?url=http%3A%2F%2Fwww.dbs576.com%2FKXT%2520Voice%2520Mail%2FDBS%2520and%2520824%2520with%2520TVS50.pdf

Kxtvet, wont the the newer TVA also connect through slt ports

I just took a used TVS50 in on trade I'll let go for a reasonable price if you need one.

tva 50 sure.

Yes a voicegate has built in settings for dbs too...