answer_machine.pl
* answer machine which can play a welcome message and
record calls
* can handle multiple calls in parallel
stateless_proxy.pl
* not so simple stateless proxy which will forward
SIP packets between legs
* can forward based on destination domain
* can have registrars on legs and forward to registered
clients
* can do NAT either in-process or together with
nathelper.pl
nathelper.pl
* standalone process to rewrite proxy RTP connections
* works together with stateless_proxy.pl or anything else
which uses Net::SIP::NATHelper::Server