The innovaphone IP222 offers different protocols, like H.323 or SIP, to fulfil the various requirements. The discovered vulnerability was found in the protocol SIP/UDP. Therefore a specially crafted SIP request to the open 5060/UDP port causes a denial of service condition by crashing the innovaphone IP222 phone immediately. Remote code execution via this security vulnerability may also be possible, but was not confirmed by the SySS GmbH.