Yet Another Telephony Engine (YATE)

 YATE is a telephony engine aimed at creating a telephony server that
 performs well enough to deal with PBX requirements and also flexible
 enough for complex Gateway and IVR solutions.
 .
 Features:
  VoIP server
  SS7 switch
  VoIP client
  Jabber server
  Jabber client
  Conference server - with up to 200 voice channels in a single conference
  VoIP to PSTN gateway
  PC2Phone and Phone2PC gateway
  IP Telephony server and/or client
    H.323 gatekeeper
    H.323 multiple endpoint server
    H.323<->SIP Proxy
    SIP session border controller
    SIP router
    SIP registration server
    IAX server and/or client
    Jingle client or server
    MGCP server (Call Agent)
  ISDN passive and active recorder
  ISDN, RBS, analog passive recorder
  Call center server
  IVR engine
  Prepaid and/or postpaid cards system
 .
 This package contains YATE Server itself.