RN3138 From linux to SMB share

Hello.

I'm running a FreePBX VoiP server and I'm trying to share recorded calls directly to the ReadyNAS SMB share. The problem is that I'm constantly getting a permision denied error. I've mapped the smb share on the PBX and I'm able to create folders and even files through mkdir or nano logged as root. Unfortunately the automatic system which saves the recordings is not using a root account or privilages - it uses different user. And that's where I'm stuck and I don't really know how to make it work. I've created a username on ReadyNAS with same credentials as on the PBX and it still doesn't want to work. Does anyone know how to make it work, or should I just try to do it in a different way (maybe an rsync? FTP?). I know it sounds complicated, but the goal that I want to achive is simple - to give everyone an access to their recorded calls right after they finish the conversation, and the default location of the recorded calls is on the PBX server where only I have access (and it has to stay that way :) ).

I'm aware that it's not only ReadyNAS related, but maybe someone had simillar problem (maybe not directly with PBX but with any other linux-based system).

Cheers.