See your device configuration. Look at
Setting up Linksys PAP2 - Voxalot FAQ.
To use alternate SIP ports such as 2060, you should configure not only 'Proxy' but also 'Outbound Proxy'. In both you should have something like 'us.voxalot.com:2060'. You should also have enabled the use of Outbound Proxy in your ATA or softphone settings. If you don't do it, your connection wouldn't work properly.
Regards,