T38P Phones Not Hold/Resume while in Call

[exuberocity]

All,

We have a location (FreePBX) that has multiple T38Ps and we're having some weird issues. We have a couple phones that when you're in a call if you place them on hold you cannot pick the phone call back up again with the resume button or pressing the line key.

We have another phone that is working just fine. So What I have done is below:

---With Endpoint Manager---
1. Removed all the config files, rebuilt them and had the phones reconnect. The same phones with issues still had issues and the ones that were working remained working.
2. This was with and without a factory reset on the phones that were not working

---Without Endpoint Manager---
1. Factory reset one of the broken phones and imported the config from the working phone. Same issue
2. Left the firmware upgraded on one of the broken phones and imported a working config. Same issue

Help?

Shane