You should certainly be able to register multiple devices with Voxalot.
Is your ATA in use behind a router with a private IP address?
If yes, it will probably need to be set up using STUN, and perhaps also Port forwarding to the ATA IP address.
Also, are the 2 accounts on your ATA using the same SIP and RTP ports?
If yes, you are very likely to have Port conflicts, that the Voxalot server and router cannot resolve.
One suggestion would be to offset the SIP ports (Eg. Account 1 on 5060, and Account 2 on 5062), and similarly for the RTP ports (5004, 5006).
In addition, forwarding these ports (5060-5063, 5004-5006) to your ATA's IP address might also help solve the issues you are having.
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