Following documents are recommended reading: http://www.uniras.gov.uk/vuls/2004/006489/h323.htm http://www.cisco.com/warp/public/707/cisco-sa-20040113-h323.shtml --Kauto Kauto Huopio - kauto.huopio@ficora.fi Information Security Adviser / CERT-FI -coordinator Finnish Communications Regulatory Authority / CERT-FI tel. +358-9-6966772, fax. +358-9-6966515 CERT-FI duty desk +358-9-6966510 / http://www.cert.fi