The Asterisk and Zaptel development teams have released Asterisk version 1.2.17. Along with minor bug fixes, this release incorporates a fix for the SIP DoS vulnerability recently discovered by INRIA Lorraine (http://voipsa.org/pipermail/voipsec_voipsa.org/2007-March/002275.html). All users of Asterisk 1.2 with the SIP channel driver loaded and connected to an untrusted network are urged to update to this release to avoid the possibility of experiencing this problem. Thanks for your support of Asterisk and Zaptel!