© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Configuring Voice Networks Introducing Signaling and Call Control

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Outline Overview VoIP Signaling Call Control Models Translation Between Signaling and Call Control Models Call Setup Call Administration and Accounting Summary Lesson Self-Check

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Model for VoIP Signaling and Call Control VoIP signaling components –Endpoints –Common control Common control components –Call administration –Accounting

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Call Control Models H.323 SIP MGCP H.248/Megaco protocol SAP RTSP Cisco CallManager

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Translation Between Signaling and Call Control

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v RTP Sessions

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Call Feature Negotiation

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Call Administration and Accounting Administration –Monitors call activity –Monitors resource utilization –Supports user service requests Accounting –Maintains CDRs

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Call Status

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Address Registration

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Address Resolution

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Admission Control

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Summary VoIP signaling and call control require endpoints and common control components, such as call administration and accounting. Protocols used for signaling and call control in VoIP include H.323, SIP, MGCP, Megaco, SAP, RTSP, and Skinny. Translation between signaling and call control can be achieved at a gateway that implements two or more of the call control capabilities. Translation does not require manipulation of the audio path, only the control path. One of the main objectives of signaling and call control is to exchange parameters for RTP session establishment and to allow the negotiation of special call features.

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Summary (Cont.) Call administration includes call status, address management, and admission control services. Accounting provides call detail records. Call status provides access to information about calls in progress and facilitates the creation of historical records for cost distribution and network planning. Address management facilitates registering and locating endpoints. Access control limits unauthorized access and oversubscription to network resources.

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v