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VoIP Signaling and Call Control

VoIP Signaling and Call Control. Cisco Networking Academy Program. Need for Signaling and Call Control. Model for VoIP Signaling and Call Control. VoIP signaling components Endpoints Common control Common control components Call administration Accounting. Call Control Models. H.323

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VoIP Signaling and Call Control

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  1. VoIP Signaling and Call Control Cisco Networking Academy Program

  2. Need for Signaling and Call Control

  3. Model for VoIP Signaling and Call Control • VoIP signaling components • Endpoints • Common control • Common control components • Call administration • Accounting

  4. Call Control Models • H.323 • SIP • MGCP • H.248/Megaco protocol • SAP • RTSP • Cisco CallManager

  5. Translation Between Signaling and Call Control

  6. RTP Sessions

  7. Call Feature Negotiation

  8. Call Administration and Accounting • Administration • Monitors call activity • Monitors resource utilization • Supports user service requests • Accounting • Maintains call detail records

  9. Call Status

  10. Address Registration

  11. Address Resolution

  12. Admission Control

  13. Centralized Call Control

  14. Distributed Call Control

  15. Centralized Call Control vs. Distributed Call Control

  16. Configuring H.323

  17. H.323 and Associated Recommendations

  18. H.323 Adapted to IP

  19. H.323 Terminals

  20. H.323 Gateways

  21. IP-to-IP Gateways

  22. H.323 Gatekeepers

  23. Multipoint Conference Components

  24. Component Relationships for Call Establishment and Management • Endpoint (gateway) to endpoint (gateway) • Endpoint (gateway) to gatekeeper • Gatekeeper to gatekeeper

  25. RAS Messages

  26. H.323 Basic Call Setup

  27. H.323 “Fast Connect” Call Setup

  28. Finding and Registering with a Gatekeeper

  29. Call Flow with a Gatekeeper

  30. Gatekeeper-Routed Call Signaling

  31. Multipoint Conferences

  32. Scalability with Multiple Gatekeepers

  33. Call Flow with Multiple Gatekeepers

  34. Survivability Strategies • HSRP • Gateway preconfigured for two gatekeepers or for multicast discovery • Multiple gatekeepers configured for the same prefix • Multiple gateways configured for the same prefix H.323 replication strategies include the following:

  35. H.323 Proxy Server

  36. Cisco Implementation of H.323

  37. Configuration Example

  38. Configuring the Gateways • Gateway 1

  39. Configuring the Gateways (Cont.) • Gateway 2

  40. Configuring the Gatekeepers • Gatekeeper 1

  41. Configuring the Gatekeepers (Cont.) • Gatekeeper 2

  42. Example: show Command

  43. Configuring MGCP

  44. MGCP and Associated Standards • MGCP is defined in RFC 2705, October 1999 • MGCP architecture and requirements are defined in RFC 2805, April 2000 • Centralized device control with simple endpoints for basic and enhanced telephony services • Allows remote control of various devices • Stimulus protocol • Endpoints and gateways cannot function alone • Uses IETF SDP • Addressing by E.164 telephone number

  45. MGCP Components

  46. Endpoints Eight types of endpoints are defined in RFC 2705: • Digital channel • Analog line • Announcement server access point • IVR access point • Conference bridge access point • Packet relay • Wiretap access point • ATM trunk side interface

  47. Endpoint Identifiers

  48. Gateways and Their Roles • Trunk gateway SS7 ISUP • Trunk gateway MF • NAS • Combined NAS/VoIP gateway • Access gateway • Residential gateway • Announcement servers

  49. Call Agents

  50. Basic MGCP Concepts • Calls and connections • Events and signals • Packages and digit maps

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