This is the [Vivox ] section from my working setup for the Vivox
provided free service to educators and non-profits...
[VivoxVoice]
enabled = true
vivox_server = www.osp.vivox.com
vivox_sip_uri = osp.vivox.com
vivox_admin_user = your-admin-username
vivox_admin_password = your-admin-password