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.
https://exchange.xforce.ibmcloud.com/vulnerabilities/36170
http://www.vupen.com/english/advisories/2007/2970
http://www.securitytracker.com/id?1018598
http://securityreason.com/securityalert/3059
http://secunia.com/advisories/26568
http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/065417.html