Cisco ATA 190 settings for a fax machine - having frequent problems with fax machines not negotiating

I have a Cisco UCM voip system that I am admittedly a rookie at.  We recently went through a reorganization of equipment and six of our fax machines were moved to different locations within the building.  We were trying to get off POTS lines anyway so we decided to purchase Cisco ATA 190 devices so that our Ricoh MFP devices could participate on the digital phone system.  These installed just fine and have worked fine, or so we thought.  After being on them for a month or two I am getting a lot more help desk calls stating that incoming faxes are taking forever or failing altogether.  For example, I have a site that faxes here quite often.  When they fax it will often times take 20 minutes to receive a fax from them successfully when the fax machine here isn't busy doing anything else and the other side is not busy either.  In another instance, I had a different facility report that they could not fax to us.  I happened to have the speaker turned on in that Ricoh MFP and I could hear it pick up and try to negotiate and then it would drop the call.  The process would repeat dozens of times and then a fax would finally come through.

I am curious if there are any settings in the ATA 190 that I need to tweak or if there is something that needs to be tweaked in Cisco UCM for the device?  Nothing in the interface on the ATA 190 sticks out at me and I don't even see a setting to lower the baud rate.  I did set up the ATA to send debug messages to a syslog server so maybe that will yield something.  Just looking for people who have implemented these with success that may have some tips.  Thanks.