Guide IP Telephony, Second Edition

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Thank you to Brett Bartow, Chris Cleveland, and the entire Cisco Press team, who are excellent at what they do and made this book possible. In actual configuration examples and output not general command syntax , boldface indicates commands that are manually input by the user such as a show command. Introduction Professional certifications have been an important part of the computing industry for many years and will continue to become more important.

Many reasons exist for these certifications, but the most popularly cited reason is that of credibility. Goals and Methods The most important goal of this book is to provide you with knowledge and skills in Unified Communications, deploying the Cisco Unified Communications Manager prod- uct. This book provides questions at the end of each chapter to reinforce the chapter content. Additional test-preparation software from com- panies such as www. The organization of this book helps you discover the exam topics that you need to review in more depth, helps you fully understand and remember those details, and helps you test the knowledge you have retained on those topics.

This book does not try to help you pass by memorization, but helps you truly learn and understand the topics. The knowledge contained in this book is vitally important for you to consider yourself a truly skilled Unified Communications UC engineer. The CCNP Voice could mean a raise, promotion, new job, challenge, success, or recognition, but ulti- mately you determine what it means to you.

Certifications demonstrate that you are seri- ous about continuing the learning process and professional development. In technology, it xix Engineers must continually retrain themselves, or they find themselves with out-of-date, commodity-based skill sets. Strategies for Exam Preparation The strategy you use for exam preparation might be different than strategies used by others.

It will be based on skills, knowledge, experience, and finding the recipe that works best for you. Regardless of the strategy you use or your background, this book is designed to help you get to the point where you can pass the exam. CUCM hardware requirements, operat- ing system, database, signaling, licensing, and database replication are discussed. This chapter introduces the technologies required for the different UC models. The advantages and disadvantages of each deployment model are consid- ered. The chapter also covers frequently adjusted CUCM enterprise and service parameters.

IP Telephony

MGCP, H. Digit analysis and path selec- tion are achieved through the use of the router pattern, route list, and route group CUCM configuration elements. The chapter also covers time-of-day rout- ing through the use of time periods and time schedules.

TERENA> Mail-Archives> Tf-Vvc> TF-VVC Mailing LIst archives

Call-hunting flow is discussed through the various distribution algorithms supported in CUCM. The media resource topics include music on hold MoH , confer- ence bridges, annunciators, transcoders, and media termination points. This page intentionally left blank Understanding the role that CUCM plays in a UC deployment to provide the essential call-routing functions necessary to deploy voicemail, unified messaging, presence, video to the desktop, videoconferencing, TelePresence, and cloud-based services such as those provided by Cisco WebEx Connect is integral to the success of UC.

This chapter introduces and describes the role, architecture, hardware and software requirements, and licensing model of CUCM. It enables more effective, secure communications and can transform the way in which we communicate. UC repre- sents a communications paradigm shift like that of the invention of the telegraph. UC removes the geographic barriers of effective communications through the use of voice, video, and data integration. Business can be conducted with a fluidity that progresses and evolves with you.


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Information has been at our fingertips for a long time, but UC enables the sharing of this information to create knowledge and value. Cisco UC is part of an integrated solution that includes network infrastructure, security, mobility, network management products, lifecycle services, flexible deployment, and third-party communication applications.

Cisco UC can impact the bottom line by creating more effective communications with- out losing the personal nature of a face-to-face conversation. More effective communica- tions lead to reduced time to market and nimble transformation of business processes through collaboration. Cisco UC equipment is capable of managing all three traffic types and interfacing with all standards-based network protocols.

Cisco UC represent new ways of delivering functionality to enterprise customers. Cisco UC is a coordinated release of an integrated set of products that are tested, documented, and supported as a cohesive system. Figure illustrates four standard layers of the Cisco UC model with examples of the components within each layer of the model. The infrastructure layer carries voice, video, and data between all network de- vices and applications.

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This layer also provides high availability, management, quality of service QoS , and network security. Call processing is independent from the infrastructure layer.

The MeetingPlace product integrates lecture-style conferences with scalable collaboration and control tools. Cisco WebEx is positioned to the small- to medium-sized enterprises, with MeetingPlace focused on large enterprise installations. Cisco ER provides physical location updates for mobile devices to guarantee that emergency calls to the public safety answering point PSAP are properly routed to the PSAP in charge of emergency calls for that site.

Deploying this capability helps ensure more effective compliance with legal or regulatory obligations, thereby reducing the life and liability risks related to emergency calls. SIG, H.

Voice over IP Fundamentals: Chapter 9, 'Billing and Mediation Services'

Cisco UC Network The Cisco UC system delivers fully integrated communications, converging voice, video, and data over a single network infrastructure using standards-based protocols. The Cisco UC system delivers capabilities to address current and emerging communications needs in the enterprise environment, as illustrated by the network topology shown in Figure The Cisco UC product suite is designed to optimize functionality, reduce configuration and maintenance requirements, and provide interoperability with a variety of other appli- cations.

It provides this capability while maintaining high availability, QoS, and security. Cisco UC includes a wide array of hardware and software products such as call-processing agents, IP phones, voice-messaging systems, video devices, conferenc- ing, and many other applications. Cisco Unified Contact Center promotes efficient and effective customer communications across large networks by enabling organizations to draw from a broader range of resources to service customers. These resources include access to a large pool of agents and multiple channels of communication and customer self-help tools.

Unified Contact Center enables powerful applications using database ODBC queries, skill-based routing, and queuing based on programming scripts. Cisco Unified Video Advantage does not require special end-user training. Video calling with CUVA is as easy as dialing a phone number. These packet telephony network devices include Cisco IP Phones, media-pro- cessing devices, VoIP gateways, and multimedia applications.

Additional data, voice, and video services, such as converged messaging, multimedia conferencing, collaborative con- tact centers, and interactive multimedia response systems, interact with the IP telephony solution through the CUCM application programming interface API. User authentication can be performed locally or against an external directory service.

Kundrecensioner

Directory synchronization allows centralized user management. Directory synchronization allows CUCM to leverage users already configured in a corporate-wide directory service, such as Microsoft Active Directory and Multiple CUCM servers in a cluster share a database that is replicated between the servers. All supplementary services call hold, park, transfer, conference are trans- ported as call-signaling events. The users on the active call would not be aware of the CUCM failure unless they attempted to use a feature on the phone during the call.

CUCM is involved only in call setup, teardown, and the invocation of supplementary service features. As shown in the figure, the following steps occur during a call from phone A to B: 1. CUCM responds to this stimulus message with a response message that tells the device to play the dial tone file that is stored in the flash memory of the phone. The calling party at phone A then hears dial tone and begins dialing the phone num- ber of phone B called party. Regardless of how the digits are collected, CUCM performs digit analysis against the dialed digits collected from the calling party.

When a match is found in the call-routing database, CUCM routes steers the call to the called party based on the call-routing configuration. If CUCM does not find a match, a reorder tone is sent to the calling party. CUCM sends a signaling event to the calling party phone A to initiate ringback, so the user at phone A will hear the ringback tone. CUCM also signals the call to the called destination phone ringdown.

Additional information is provided to the phones to indicate the calling and called party name and number. When the user at phone B accepts the call goes off hook , CUCM sends a signaling message to the devices to coordinate the IPv4 socket IPv4 address and port num- ber information that will be used for the duration of the call. The RTP media path is opened directly between the two phones over the network infrastructure, which removes the CUCM reliance during the call. No further communication with CUCM takes place until either phone invokes a sup- plementary service feature transfer, conference, hold or the call is ended.

A network appliance is a closed system that supports only Cisco-authorized applications and utilities. Goals of the appliance model include simplifying installation, security, and patching of the system. The appliance-based model makes it possible for an administrator to install, implement, and manage a CUCM server without requiring any knowledge of the underlying Linux-based operating system.

Third-party access is allowed through docu- mented APIs only. Database redundancy is provided by sharing a common database replicated across the CUCM servers. Call-processing redundancy is achieved through the CallManager Group setting, in which multiple servers are assigned to a device for the purposes of providing call-signaling fault tolerance. A CUCM cluster can have up to 20 servers in it.

The publisher repli- cates the database as a read-only database to up to eight subscriber servers in the CUCM cluster.

Key Benefits:

Each cluster has a restriction of four subscriber servers that can perform active call processing. Additional subscriber servers are dedicated standby servers in case the active subscriber server is not available. The additional 11 servers in the cluster are responsible for various services, including TFTP and media resources conferencing, music on hold, transcoding and integration with third-party applications through APIs.

CUCM Cluster Clustering allows the network to scale to several thousands of endpoints, provides redun- dancy in case of network or server failure, and provides a central point of administration. Figure displays a publisher database synchronizing the database to all the other servers in the cluster. The servers running the CCM. CUCM clustering allows call signaling to be distributed among multiple servers, increasing the scalability and performance of the product. The database is the repository for all CUCM configuration information devices, service parameters, features, device configurations, and dial plan.

The database replicates the configuration information in a hub-and-spoke topology one publisher, up to eight subscribers.


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  5. CUCM nodes also use a second communication method to replicate some runtime data call forwarding, message waiting indicators, hunt login status using a master-master replication technology referred to as user-facing fea- tures UFF. UFF provides a full-mesh replication topology allowing dynamic registration of active call information that changes much more frequently than the database changes.

    HP servers are sup- ported at the time of this writing, but Cisco no longer resells HP servers. The Cisco server is a or inch, rack-mountable server that provides a redundant SATA hard drive, but only one power supply. The improves reliability and performance by providing a second CPU and a backup fan assembly. CUCM can be installed on any other VMware platform for a lab environment workstation, server, player , but will not be supported for production use. Operating system and application updates are provided by, and digitally signed by, Cisco Systems.