4. OST means STANDARD ! RFC 3261 – SIP: Session Initiation Protocol – Describes the very core of SIP – First spec to read RFC 3263 – Locating SIP Servers – How to locate SIP servers (DNS) based on a SIP URI RFC 3265 – SIP Specific Event Notification – Defines the SIP methods that enable subscription and notifications www.wildix.com
5. RFC 3261 – SIP Architecture Registrar Redirect Location Database REGISTER “ Here I am” INVITE “ I want to talk to another UA Proxied INVITE “ I’ll handle it for you” “ Where is this name/phone#?” Redirection “ They moved, try this address” UAC: User Agent Client UAC: User Agent Client SIP Proxy domain.com AAA The Standard ! OST Started with it… … Proprietary is joining SIP-GW
6. Asterisk SIP Elements Asterisk, as a server, is a SIP registrar and Location server and also acts as a useragent endpoint . A SIP proxy handles call control on behalf of other user agents (UA) and usually does not maintain state during a call and therefore is never the endpoint of a call ! The SIP proxy routes the UAC to UAS requests and the UAS to UAC responses . Asterisk is NOT a SIP Proxy Asterisk is a Back 2 Back User Agent Asterisk is a PBX with Media GW extensions
7. The OST Market: 2007-2008 WMS www.wildix.com Lots of Fragmentation !
8. Real Scenario www.wildix.com Open Source Telephony Ecosystem ITSP 1 ITSP N IAX2 SIP SIP IAX2 SIP LAN Asterisk PBX IAX2 LAN Asterisk PBX IAX2 PRI SIP SIP LAN 2
12. CTI PRO version for Asterisk www.wildix.com Automatic integration with Microsoft Outlook 2000 and higher Real time call notifications via pop windows Placing calls within Outlook, email message or contact Automatic contacts data update Asterisk compatibality Source Code Available