1. 1 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Session Communications API  SessionController - Interface used to control critical stream and party identification operations on a session. Only provided to a single SessionController at any given time.  Session - Encapsulates a session oriented dialogue with a peer. Provides control over the interaction.  SessionRouter - Provides extended routing capability for sessions. New sessions can be routed, existing sessions replaced with new sessions, and existing sessions replaced with other existing sessions.

2. 2 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Session Communications API  SessionEndpoint - Provides extended capability on endpoints for creating sessions to an endpoint.  Bridge - Allows for the management of a bridge and the addition or removal of sessions.  BridgeManager - Allows for the creation and management of session capable bridges.

3. 3 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Media API  Primary Interfaces – Session - Provides an interface for a media producing and consuming service. – StreamSource - Interface for an object that media originates from. Provides the ability to add and remove sinks which the media is given to. – StreamSink - Interface for an object that media is given to. A sink can only have a single source as any media given to a sink is expected to be mixed from multiple sources already.

4. 4 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Media API  Key types: – Frame - Encompasses a payload and media format. Stream specific information, such as timestamp and sequence number, exist in an extended StreamFrame type. – Format - Defines a media format. Common types are provided but this can be extended if deeper details are required.

5. 5 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Media API  Benefits of design: – Chaining – Provides the ability to insert themselves by supporting both a sink and source. Useful for media operations. – Passive Monitoring – Requiring sources to support multiple sinks allows passive monitoring to occur without putting itself in the main media chain. – Extensible – Each aspect of the media API can be extended.

6. 6 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Asterisk SCF Components

7. 7 Creative Innovation – Customer Satisfaction – Continual Quality Improvement What is a Component?  A component is implemented as a loadable module (DLL on Windows, shared library on Unix-like systems) – icebox-loadable libraries  A component that requires state replication in order to support fail-over will have a supporting replication component in its git repository

8. 8 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Service Locator  Implementation of the Discovery API  Provides means of finding needed services  Provides means of registering new services  Provides mechanism for customizing the selection logic on a service-by-service basis

9. 9 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Basic Routing Service  Implementation of the SessionRouter interface  Used as a means of... routing sessions  Voted “Most likely component to be rewritten by everyone”

10. 10 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Bridging  Implements the Bridge and BridgeManager interfaces  Responsible for connecting sessions in a manner that allows them to communicate  Responsible for passing indications/events between sessions while they are bridged

11. 11 Creative Innovation – Customer Satisfaction – Continual Quality Improvement SIP Session Gateway  Uses PJSIP as a SIP stack  PJSipSessionModule implements the Session interface – Acts on SIP INVITEs to initiate sessions. – Live sessions listen for SIP messages and indicate changes to session listeners  PJSipRegistrarModule implements a SIP registrar

12. 12 Creative Innovation – Customer Satisfaction – Continual Quality Improvement MediaRTPPJMedia  Uses PJMEDIA under the hood  Implements the MediaSession, StreamSource, and StreamSink interfaces  Listens on RTP ports for media and passes the media to whatever StreamSinks are configured.  Sends, processes, and receives RTCP as well.

13. 13 Creative Innovation – Customer Satisfaction – Continual Quality Improvement MediaFormatGeneric  Provides factory for media formats based on name and SDP  Provides translation from SDP to media format and media format to SDP  Provides methods for adding descriptors for custom media types

14. 14 Creative Innovation – Customer Satisfaction – Continual Quality Improvement MediaOperationsCore  Provides implementations of MediaOperation interfaces – Translators for common audio formats – WebRTC NetEQ-based jitter buffer – In-band telephony event detector

15. 15 Creative Innovation – Customer Satisfaction – Continual Quality Improvement MediaTransportUDPTL  Uses PJMEDIA for UDP transport and the Asterisk UDPTL stack for UDPTL.  Provides a media implementation for UDPTL streams.

16. 16 Creative Innovation – Customer Satisfaction – Continual Quality Improvement Logger  Provides for a method to record messages while Asterisk SCF is running  Client provides for ostream-style logging to a file or over Ice  Server can accept messages over Ice, allowing logs to exist on different servers if desired.

17. 17 Creative Innovation – Customer Satisfaction – Continual Quality Improvement ice-util-cpp  Common Ice-related functionality implemented in C++ – Library classes and template definitions for direct use within C++ components  SmartProxy  BaseComponent  WorkQueue  ThreadPool  Many more!