I have a ton of ATA 190's in production on CUCM System version: 10.5.2.12901-1.
These devices constantly become unregistered and have to be reset before they will work again.
I use these for fax machines.
Any idea what causes this?
If you are only connecting one fax machine, does it matter if you use phone 1 or phone 2 port?
Do you have these endpoints over the WAN or local to the CUCM network? I do see lot of software bugs related to unregistration for ATA190. Below are some for your reference:
We have both WAN & local. I have not tried any other software versions. Is 1.2(2)SR1 newer than 1.2.2(003)?
Also, what is the procedure for upgrading the software?
Yes, 1.2(2)SR1 is newer version. You need to upload firmware files on CUCM TFTP servers and restart the TFTP Service. The ATA’s will download new firmware automatically.
Yes, you can upgrade it individually. You can follow below procedure which is applicable to ATA’s as well: