A pretty cool package was released on CPAN today from Leif Johansson. http://search.cpan.org/search?query=Net%3A%3ACSTA NAME: Net::CSTA - Perl extension for ECMA CSTA SYNOPSIS: use Net::CSTA; # Connect to the CSTA server my $csta = Net::CSTA->new(Host=>'csta-server',Port=>'csta-server-port'); # Create a monitor for '555' my $number = 555; $csta->request(serviceID=>71, serviceArgs=>{monitorObject=>{device=>{dialingNumber=>$number}}}) for (;;) { my $pdu = $csta->receive(); print $pdu->toXML(); } DESCRIPTION ^ ECMA CSTA is an ASN.1 based protocol for Computer Integrated Telephony (CTI) using CSTA it is possible to write code that communicates with a PBX. Typical applications include receiving notifications for incoming calls, placing calls, redirecting calls or placing conference calls. BUGS This module currently implements CSTA phase I - mostly because my PBX (MD110 with Application Link 4.0) only supports phase I. Supporting multiple versions will require some thought since the versions are largly incompatible. The CSTA client opens a UDP port on 3333 to receive incoming usolicited notifications. This is not implemented yet. SECURITY CONSIDERATIONS ^ CSTA is a protocol devoid of any form of security. Take care to firewall your CSTA server and throw away the key.