Cisco ATA 187 faxing issues

We have a site (a new site) that has about 50 or so ATA 187's being used for faxing. Were having faxing issues where some fax machines can't fax to external (to the PSTN) fax machines. They seem to be related to Ricoh fax machines that are Super G3. Any one come across similar troubles with the ATA's? Considering going to VG224's.
Thanks!

I have around 80 ATAs in production accross 11 sites and they gave me some headaches, a simple google search will produce dozens of similar issues.
Obviously there is a lot of things that come into play such as your PSTN transport (SIP/ISDN?) and also your media transmission method (t.38 vs pass-through). Here are some questions so we can better help you.
1.Start basic, make sure the affected ATAs have an external phone number mask properly assigned, sounds easy but this is the most common reason why my clients submit tickets.
2. Are you using CUCM for call control? 
3.Collect appropriate debugs and post them, "debug ccsip messages" or "debug isdn q931) depending of your transport. Also provide us a copy of your gw config.
4. Symptoms: Issues with sending AND receiving? Error message/Busy signal? 
- Frank

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