The Grandstream SIP Phone GXV-3000 with firmware 1.0.1.7 Loader 1.0.0.6 and Boot 1.0.0.18 allows remote attackers to force silent call completion eavesdrop on the phone's local environment and cause a denial of service (blocked call reception) via a certain SIP INVITE message followed by a certain \SIP/2.0 183 Session Progress\ message.