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Cisco Voice over Frame Relay, ATM, and IP

Cisco Voice over Frame Relay, ATM, and IP

3.0 2
by Stephen McQuerry, Stephen Foy

Implement Cisco voice over data networks with the official CVoice Coursebook

This book will help you to:

  • Configure Voice over Frame Relay, ATM, or IP using Cisco IOS(r) software
  • Analyze existing voice ardware/software, and select the Cisco multiservice access devices that best serve your needs
  • Analyze existing branch and regional office


Implement Cisco voice over data networks with the official CVoice Coursebook

This book will help you to:

  • Configure Voice over Frame Relay, ATM, or IP using Cisco IOS(r) software
  • Analyze existing voice ardware/software, and select the Cisco multiservice access devices that best serve your needs
  • Analyze existing branch and regional office voice networks and services, and choose the optimum transmission method for voice traffic: Frame Relay, ATM, or IP
  • Learn the fundamentals of VoFR, VoATM, and VoIP standards, protocols, and the Cisco hardware that supports these services
  • Learn the basics of the Architecture for Voice, Video, and Integrated Data (AVVID) including CallManager, Cisco IP Phones, and related voice gateway equipment
  • Design, configure, integrate, and optimize an enterprise network in remote branch and regional offices by using integrated access technology that combines voice and data transmission over Frame Relay, ATM, and IP connections, access devices, and CIPT client hardware
  • Learn the fundamentals of PBXs, and apply the principles and concepts to develop a process for integrating Cisco equipment with PBXs and for replacing PBXs

Cisco Voice over Frame Relay, ATM, and IP is a direct complement to the Cisco authorized training course of the same name. Based on the content of the CVoice course, this book provides an intermediate-level treatment of Cisco voice technologies. The overall objective of the book is to teach engineers how to design, integrate, and configure voice over Frame Relay, ATM, and IP of enterprise or managed network services using various Cisco 2600, 3600, 3810, and 5300 multiservice accessdevices.

Coverage of analog and digital telephony fundamentals and principles of voice communications enables readers to determine optimum service selection, equipment, and configuration of a voice-over-data network. Network design engineers and network support engineers will find this book invaluable for its detailed voice coverage on Cisco IOS, hardward, and configuration as well as networking professionals pursuing the Voice Access certification or CCIE certifications.

Product Details

Cisco Press
Publication date:
Cisco Training Series
Product dimensions:
7.52(w) x 9.38(h) x 1.48(d)

Read an Excerpt

Chapter 5: Applications for Cisco Voice-over Routers

After reading this chapter, you should be able to perform the following tasks:
  • Describe the different connection types provided by Cisco voice-capable routers.
  • Identify where Cisco voice-capable routers fit in a multiservice network.
  • Evaluate the business applications enabled by Cisco voice-capable routers.
  • Compare voice-capable routers in actual network applications of VoIP, VoFR, and VoATM.
Voice-over routers, which give you the ability to control expensive communications costs, have many applications. The key to using voice-over technology is identifying where and how it is useful in a network. This chapter gives a brief overview of where Cisco Voice over Frame Relay (VoFR), ATM (VoATM), and IP (VoIP) solutions fit into the overall network picture. The chapter also gives examples of Cisco voice-capable routers in actual network applications.

Placing Cisco Voice-Capable Routers in a Network

The first task in placing voice-capable routers in a network is to understand how they fit into the overall voice architecture. Voice signaling, or communicating with voice devices, is accomplished by the router interpreting and responding to the different types of voice signaling. Cisco voice-capable routers are capable of interpreting and terminating different types of signaling, including ABCD bits, E&M, ground start, and loop start.

Instead of passing the signaling information end-to-end, in its native form, the Cisco voice-capable router locally acknowledges the signaling and terminates the signaling, as shown in Figure 5-1. The Cisco router can then use a standards-based signaling to contact the remote Cisco router. The remote Cisco voice-capable router then generates the proper local signaling to complete the call. Different types of hardware and connections interpret the different protocols in voice applications.

Figure 5-1 Routers Intercepting Voice Signals...

Cisco Voice Connection Types

...Table 5-1 lists the connection types and shows the voice functions of Cisco routers and how Cisco voice-capable routers fit in a multiservice network. These connections allow for the interpretation of standard voice protocols to provide end-to-end voice-over services. The following sections discuss these connection types and outline applications of each....

Local Connections

Cisco voice-capable routers permit phone or fax calls between two foreign exchange station (FXS) ports attached to the same voice-capable router. These calls are referred to as local because they do not traverse any network facility, and they remain local to the fabric of the router. Figure 5-2 shows an example of a local call; a standard analog phone, shown on the left, is calling another phone, 338-8801, that is physically attached to the same router.

Figure 5-2 A Local, or Phone-to-Phone, Call on the Same Router...

On-Net Connections

Although local calls can be useful, it is often more desirable to call devices that are not physically connected to the same voice-capable router. Calls can be made from a phone attached to a Cisco voice-capable router, across the data network, to another phone also attached to a voice-capable router. When this type of call is placed between two voice-capable routers within the same enterprise network it is referred to as an on-net call.

Figure 5-3 shows such a call being placed across the data network. The call is routed based on its destination pattern. The destination pattern is the phone number of the end device. When sending destination patterns between devices, extension digits can also be passed to the PBX.

Figure 5-3 An On-Net Call Between Two Local Routers...

Off-Net Connections

...It is also desirable to call devices that are not part of the same company, such as a customer or vendor in the same city as a remote office. In off-net dialing, the user dials an access code from an analog phone that is directly connected to a Cisco voice-capable router to gain access to the Public Switched Telephone Network (PSTN), or other service provider voice network. For example, in the United States the access code to get to the PSTN is usually 9. When the call reaches the PSTN, a second dial tone can be heard. At this point, the user dials the destination pattern (that is, phone number) of the party it wishes to reach. Figure 5-4 shows a typical off-net call.

PLAR Connections

PLAR automatically connects a telephone to a second phone as soon as the first phone is lifted from the cradle (that is, goes off-hook)—just like the Batphone. There is no need to dial any digits, because the first phone is automatically connected to the second phone. This application is useful for applications such as connecting customers to sales representatives, taxi dispatchers, or your friendly neighborhood superhero. Figure 5-5 gives an example of PLAR.

Figure 5-4 An Off-Net Call Using Voice-Capable Routers...

Figure 5-5 A PLAR Connection...

Tie-Line Trunks

...Tie-line trunks allow the router to connect PBX to PBX across the data network. This is accomplished over a leased-line trunk that connects the PBXs together. Signaling used for tie-line trunks includes PRI, QSIG, E&M, and T1/EQ, although others may also be supported. Figure 5-6 demonstrates the functionality of the tie-line trunk.

Figure 5-6 A Tie-Line Trunk...

...When PBX A seizes a channel, the Cisco voice-capable router inserts the correct destination pattern into the signal before dialing PBX B. The call is PBX to PBX, instead of handset (phone) to handset (phone)....

Meet the Author

Steve McQuerry is a Certified Cisco Systems Instructor (CCSI) who works as a contract instructor and consultant throughout the U.S. teaching networking professionals how to configure and integrate Cisco equipment into their networks. Steve also holds CNE, MCSE, MCT, CCNA and CCNP certifications. He has worked in the networking industry for 10 years, and has experience with multiple protocols in small and large networks including TCP/IP and IPX. Steve currently teaches the Cisco courses ICND, ICRC, ACRC, CIT and CLSC with Global Knowledge.

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Cisco Voice over Frame Relay, ATM, and IP 3 out of 5 based on 0 ratings. 2 reviews.
Guest More than 1 year ago
I recently picked up a copy of the Cisco Press ¿Cisco Voice Over Frame Relay, ATM and IP¿ (ISBN: 1578702275) for review and study for a variety of my Cisco IP Telephony Specialization exams. As some of the previous reviews mentioned, the book does lacks some of the breadth and depth required for some of the newer Cisco IOS features. However, if you are interested in learning the fundamentals of Cisco Voice over Frame Relay, ATM and IP, then this book should serve as a very good starting point. However, any reader should realize that Cisco in constantly adding new feature to IOS as well new hardware platforms. Therefore, if the reader is planning to use this book for exam prep, he/she should visit CCO to complement the information in this book. The first section of the book discusses the historical and theoretical components of both analog telephony and digital telephony. The book provides excellent coverage of analog technologies for those of us from the data/digital world. The early chapters discuss the various signaling concepts, sampling, and voice digitization. The second section of the book covers off on the Cisco-specific hardware platforms that support Voice over Frame Relay, ATM and IP. This is where the book is probably the weakest, mostly due to the fact that much of the router platforms discussed are now End-of-Sale for Cisco. Again, I would recommend that the reader visit Cisco.com after reading this section for the latest on Cisco-specific hardware platforms that support Voice over Frame Relay, ATM and IP. The third section provides the reader with nuts-and-bolts of configuring Cisco Voice over Frame Relay, ATM and IP. Here is where the reader can improve his/her engineering skills by looking at the tons of sample configurations to support VoFR, VoIP, VoATM, QoS, Toll-bypass, and legacy-PBX integration. The final section of the book covers off on both the legacy ¿old-world¿ enterprise PBX technologies and the emerging IP Telephony technologies. This section would probably have been better served by moving it to the beginning of the book during the discussion of Analog Telephony and Digital Telephony. All in all, I would recommend the book to any reader who is interested in learning the fundamental basics of Cisco Voice over Frame Relay, ATM and IP, with the one caveat that the reader will need to augment the materials with the latest information from Cisco¿s website.
Guest More than 1 year ago
If you are looking for a good preparation for taking the CVoice exam, then keep looking. This book has a lot of good info in general, but as a test prep it misses the mark. Just ask me since I studied the heck out of this text and failed miserably on the exam. I guess I'm used to books that help me prepare to actually *pass* exams! For example, MGCP gets about 1 paragraph in this book.. but the exam requires in-depth knowledge of that protocol ...which I now see was indicated on Cisco's test blueprint all this time. Sigh. If you need VoWhatever info, just get articles off the Cisco website, and save your money.