The Scheduled Maintenance for Improvement of SIP and WebRTC Services is now terminated. The new IP for phone.plivo.com is now 52.9.254.123/32. Please ensure your SIP devices, SIP softphones, WebSDK clients are resolving the DNS record phone.plivo.com to the new IP 52.9.254.123/32. You can refer to the maintenance documentation below: https://www.dropbox.com/s/ofyibn5m492hgkl/Maintenance_20161009.pdf?dl=0