first the technology, than the security in VOIP
The Voice over IP Security Alliance (VOIPSA) aims to fill the void of VoIP security related resources through a unique collaboration of VoIP and Information Security vendors, providers, and thought leaders. http://www.voipsa.org/
and better late than never
The Technical Advisory board is in the process of planning the near term projects for 2005. These projects will involve developing VoIP security testing tools and methodologies, as well as documentation on VoIP security threats and mitigation strategies. The projects will be formalized and launched in early March with an official call for community participation.
what are the risks : DDOS attacks, eavesdropping, malware included in packages,....