Building Applications Using SIP Scott Hoffpauir Vice President, Engineering Fall 1999 VON, Atlanta

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 2 Baseline Architecture SIP User Agents Proxy / Redirect Server SIP Distributed architecture for intelligent endpoints Media Gateways Media Gateway Controller MGCP Centralized architecture for trunks and signaling links Call Management System Multimedia Terminal Adapters MGCP Centralized architecture for residential phones Packet Network

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 3 Components Media Gateway Multimedia Terminal Adapter Client Phone  Packet Interface  Signaling Interworking  Media Transcoding Media Gateway Controller Call Management System Proxy and Redirect Server  Basic Call Control  Authentication and Security  Billing  Bandwidth Management ? Enhanced Services

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 4 SIP Application Server Application Server Call Server SIP Proxy and Redirect Server Web Server Enhanced Services Management Feature Server Enhanced Services Execution Media Server Conferencing, IVR Resources Using SIP, enhanced services, which reside on an application server, are separated from basic call functions

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 5 Application Server Connectivity Directory Servers Servers Media Servers Web Servers Application Server SIP Media Gateways Media Gateway Controller MGCPSIP Call Management System Multimedia Terminal Adapters User Agents Proxy / Redirect Server SIP MGCP SIP MGCP SIP Packet Network

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 6 Technology Convergence Interactive Voice Response Unified Messaging Cable Set Top Boxes Billing Systems Wireless PDA Multimedia Streaming OAMP Personal Information Managers Web Browser Multimedia Record & Playback Multimedia Conferencing Text to Speech Directory Services Communication Entities Application servers provide a platform for integrating telephony services with Internet, messaging, devices, and OAMP services Application Server SIP

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 7 SIP as an Enhanced Services Protocol  Open, simple, extensible, and lightweight protocol  Internet heritage – easier to integrate with telephony and Internet functions  Already implemented or planned on most softswitches and gateways  Allows control of bearer path  Supports multiple call legs (i.e., forking)  Same protocol used between services and call control entities

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 8 Service Possibilities Application Server Invite 3XX Redirect Basic Call Control Routing Services Media Manipulation Services Application Server Invite 200 OK Basic Call Control Event Notification Services Application Server Invite Basic Call Control

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 9 Service Execution Media Gateways Media Gateway Controller Call Mgmt System Multimedia Terminal Adapters Packet Network Execution Environment Barring Service Directory Service PIN Service Logging Service SIP I/F LDAP I/F IVR I/F I/F Screen out 900 and 976 Calls To: Bob Smith Retrieve Directory Information Collect 4 Digits and Validate PIN Play Tone Collect DTMF Send Log call attempt Invite Application Server

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 10 Summary  Enhanced services are key to the success of packet telephony  SIP application servers can be used to augment entities providing basic call control functions  SIP application servers can be used across different architectures (H.323, MGCP)  SIP is a simple, open, and well-defined interface encouraging third party application services and vendor independence

BroadSoft – Scott Hoffpauir – Building Applications Using SIP - 11 BroadSoft Company Founded September 1998, in Gaithersburg, Maryland Objective Deliver an enhanced services creation software suite to service providers Product Service execution, management, and creation platform for broadband packet communications networks

Building Applications Using SIP Scott Hoffpauir BroadSoft, Inc. 200 Perry Parkway, Suite 1 Gaithersburg, MD (301)