Download GNU SIP Witch 0.5.6

GNU SIP Witch is a pure SIP-based office telephone call server that supports generic phone system features like call forwarding, hunt groups and call distribution, call coverage and ring groups, holding, and call transfer, as well as offering SIP specific capabilities such as presence and messaging. It supports secure telephone extensions for making calls over the Internet, and intercept/decrypt-free peer-to-peer audio and video extensions. It is not a SIP proxy, a multi-protocol telephone server, or an IP-PBX, and does not try to emulate Asterisk, FreeSWITCH, or Yate.

Update:
Call transfer between secure extensions has been added. A complete rewrite of network access rules to allow automatic and integrated detection of NAT and peering addresses for computation of optional RTP media proxy and sdp rewrite rules. Future media proxy work will be fully integrated with the server, and hence the external rtp proxy plugin has been removed.