xl2tpd a Layer 2 Tunneling Protocol (L2TP) daemon. It supports IPsec SA reference tracking, which enables the IPsec stacks to support multiple l2tp clients behind the same NAT router and multiple l2tp clients on the same internal IP address. It is a fork of "l2tpd".
Release focus: Minor feature enhancements
Changes:
Support for passwordfd, a workaround for some Cisco routers, and extended logging.
Siproxd is a proxy/masquerading daemon for the SIP protocol.
It handles registrations of SIP clients on a private IP network
and performs rewriting of the SIP message bodies to make SIP
connections work via an masquerading firewall (NAT).
It allows SIP software clients (like kphone, linphone) or SIP
hardware clients (Voice over IP phones which are SIP-compatible,
such as those from Cisco, Grandstream or Snom) to work behind
an IP masquerading firewall or NAT router
