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SylkServer allows creation and delivery of rich multimedia applications accessed by SIP User Agents. The server supports SIP signaling over TLS, TCP and UDP transports, RTP and MSRP media planes, has built in capabilities for creating ad-hoc SIP multimedia conferences with HD Audio, IM and File Transfer and can be easily extended with other applications by using Python language.



  • TLS, TCP and UDP transports
  • INVITE and REFER methods
  • SIP protocol trace


  • Wide-band (G722, Speex)
  • Narrow-band (G711, GSM)
  • sRTP encryption
  • ICE NAT traversal

Instant Messaging

  • Chat Sessions (MSRP)
  • Composition indicator
  • CPIM envelope
  • Delivery reports


  • Wideband RTP mixer
  • MSRP switch
  • Conference Event
  • Add/remove participants

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