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Adrian Georgescu, 04/29/2012 04:38 pm

Description

SylkServer is a SIP application server based on SIP SIMPLE Client SDK that can be programmed to perform SIP end-point applications. Examples of such server applications are conferencing, media offline storage, playing voice prompts, IVR, or gateway to other protocols like XMPP. 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.

Deployment

SylkServer is not designed to transparently route packets, authorization, accounting and handle NAT traversal for signaling or media. Performing applications like SIP Proxy, Registrar, or Presence Agent are out of its scope. SylkServer must be typically deployed behind a SIP Proxy for providing such functions.

SylkServer is horizontally scalable with the amount of available hardware by using SIP Thor, a P2P based self-organizing network technology.

Features

SIP Signaling Conferencing NAT Traversal
TLS, TCP and UDP transports Wideband RTP mixer SIP Outbound Proxy
INVITE and REFER MSRP switch ICE and STUN
SUBSCRIBE/NOTIFY Conference event package MSRP Relay
Protocol tracing Add/remove participant MSRP ACM
Voice over IP Instant Messaging File Transfer
* Wideband (G722 and Speex) MSRP protocol
* Narrowband (G711 and GSM) CPIM envelope Progress reports
* sRTP encryption Is-composing indicator Conference-info extension
* Hold/Unhold Delivery reports Conference room persistent

Implemented Standards

  • MSRP protocol RFC4975
  • MSRP relay extension RFC4976
  • MSRP File Transfer RFC5547
  • MSRP Alternative Connection Model RFC6135
  • MSRP switch draft-ietf-simple-chat-10
  • Indication of Message Composition RFC3994
  • CPIM Message Format RFC3862
  • Conference event package RFC4575
  • A Framework for Conferencing with SIP RFC4353
  • Conferencing for User Agents RFC4579
  • 5.1 INVITE: Joining a Conference Using the Conference URI - Dial-In
  • 5.2 INVITE: Adding a Participant by the Focus - Dial-Out
  • 5.5 REFER: Requesting a Focus to Add a New Resource to a Conference
  • 5.11 REFER with BYE: Requesting a Focus to Remove a Participant from a Conference

SIP-XMPP Gateway specifications (roadmap)