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Cisco 1751 Voice-over-IP Quick Start Guide
The Cisco 1751 Voice over IP Quick Start Guide explains how to install WAN Interface Cards and Voice
Interface Cards, how to run configuration tools, and how to perform essential Voice-over-IP (VoIP)
configuration tasks.
This document contains the following sections:
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Audience
This guide is intended primarily for users who configure and maintain routers, but are not necessarily
familiar with tasks, the relationship between tasks, or the commands necessary to perform particular
tasks to configure VoIP. We assume that you are familiar with Cisco IOS software, IP and telephony
networks, and PBX operation for E&M installations.
List of Terms provides definitions for many of the technical terms used in this document.
Corporate Headquarters:
Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA
Copyright © 2003 Cisco Systems, Inc. All rights reserved.
Audience, page 1
Conventions, page 2
Installing WAN and Voice Interface Cards, page 2
Cisco Router and Security Device Manager, page 9
Configuring Voice-over-IP, page 10
List of Terms, page 30
Obtaining Documentation, page 31
Documentation Feedback, page 32
Obtaining Technical Assistance, page 32
Obtaining Additional Publications and Information, page 33
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Table of Contents
Related Manuals for Cisco CISCO1751
Summary of Contents for Cisco CISCO1751
- Page 1 PBX operation for E&M installations. List of Terms provides definitions for many of the technical terms used in this document. Corporate Headquarters: Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA Copyright © 2003 Cisco Systems, Inc. All rights reserved.
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Page 2: Conventions
Conventions Conventions This document uses the following conventions: Commands and keywords are in boldface. • Optional keywords or arguments are in square brackets. • Variables for which you supply values are in italic. • Titles of publications and new words or concepts are in italic. •... - Page 3 Figure 1 Voice Interface Card E&M SEE MANUAL BEFORE INSTALLATION You should install and cable VICs before performing the software configuration tasks explained later in this guide. Be sure to observe all warnings and safety precautions in the installation guide. Warning Caution VICs do not support online insertion and removal (hot swap).
- Page 4 Installing WAN and Voice Interface Cards Figure 2 Inserting a WIC or VIC in the Router SL OT V IC 2F X SE E M AN UA L BE FO IN ST AL LA TI O Interface card If you need more detailed installation instructions, refer to the Cisco WAN Interface Cards Hardware Installation Guide.
- Page 5 Figure 3 Connecting VICs to the Network FXS VIC SEE MANUAL BEFORE INSTALLATION FXO VIC SEE MANUAL BEFORE INSTALLATION E&M VIC E&M SEE MANUAL BEFORE INSTALLATION When you are finished, reinstall any network interface cables you removed and turn on power to the router.
- Page 6 Installing WAN and Voice Interface Cards Figure 5 shows the wiring pattern for an E&M connector, and The E&M VIC pinout depends on the PBX type and connection. Pins that are not used should not be Note connected. Figure 5 RJ-48S Wiring for E&M Connectors Table 2 E&M Pinouts...
- Page 7 The card is illustrated in Figure 6 2-Port ISDN BRI Card Front Panel 2B-NT/TE ISDN BRI S/T 1 Connecting the 2-Port ISDN BRI Card Use the straight-through RJ-45 cable to connect the 2-port ISDN BRI card to the ISDN network through a telephone wall outlet.
- Page 8 Installing WAN and Voice Interface Cards When the interface is configured as NT and is connecting to a TE device, the cable must have the transmit Note and receive pins swapped (crossover cable). (See Table 3 Interface Pin Numbers and Functions ISDN BRI NT/TE Pin 3/T+ Pin 4/R+...
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Page 9: Cisco Router And Security Device Manager
Figure 8 Cisco 1751 Router Slot Numbering Kensington-compatible locking socket 2FXS SLOT 1 OK SLOT 0 OK Slot 1 Slot 0 OK LED OK LED Figure 9 shows the VIC port numbering. Figure 9 VIC Port Numbering E&M Example If you install a VIC in both SLOT 0 and SLOT 1 of the router, the ports in each of these slots would be numbered as follows: SLOT 0—0/0 and 0/1 SLOT 1—1/0 and 1/1... -
Page 10: Configuring Voice-Over-Ip
Configuring Voice-over-IP To obtain the SDM release notes, and other SDM documentation, go to and click the Technical Documentation link. If you need to configure Voice-over-IP, use the Note Guide. Configuring Voice-over-IP Voice-over-IP (VoIP) enables a Cisco 1751 router to carry voice traffic (for example, telephone calls and faxes) over an IP network, simultaneously with data traffic. - Page 11 If the installer does not start after a few seconds, select Start>Run, and enter d:\setup where d is your CD-ROM drive. Step 5 Follow the instructions on the screen to install the Cisco ConfigMaker application. To learn about the Cisco ConfigMaker application, view the online movie, or use Cisco ConfigMaker Help Topics from the help menu.
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Page 12: Entering Configuration Mode
Configuring Voice-over-IP Information for International Users International users must set the values of certain voice-port commands, like cptone, that are specific to their country. Refer to the Cisco 1751 Router Software Configuration Guide for details. Entering Configuration Mode You can configure your router for VoIP by entering commands at the CLI. This method of entering commands is called configuration mode. -
Page 13: Saving The Configuration
For complete information about the global configuration commands and about configuring LAN and WAN interfaces on your router, refer to the Cisco IOS configuration guides and command references. The rest of this guide explains how to configure your router for VoIP traffic. Voice configuration uses a number of Cisco IOS commands. -
Page 14: Dial Plan
Configuring Voice-over-IP Dial Plan Use a dial plan to map the destination telephone numbers with the voice ports on the router. In North America, the North American Numbering Plan (NANP) is used, which consists of an area code, an office code, and a station code. - Page 15 Table 5 Sample Number Expansion Table Destination Extension Pattern 3737 14085553737 1408555... 5... 1408555... You can use a period (.) as a wildcard character representing a single digit in a telephone number. You can use the show num-exp command to verify the number expansion information. East# show num-exp After you have configured dial peers and assigned destination patterns to them, you can use the show dialplan number command to see how a telephone number maps to a dial peer.
- Page 16 Configuring Voice-over-IP You can name your router by using the global configuration hostname command. Note (For information about port numbering, refer to the section on earlier in this guide.) Table 6 West Router Telephone Numbers and Voice Ports Telephone Number 408 555-3737 408 555-4141 If your router is configured with three VICs, a total of six telephones and fax machines can be connected...
- Page 17 The telephone numbers used in this guide are only examples and are invalid for public use in the United Note States. When you configure your network, be sure to substitute your own telephone numbers. To configure the router with the dial-peer information in configuration commands: West>...
- Page 18 Configuring Voice-over-IP Figure 13 Basic Voice Network (East Router) IP cloud Table 8 East Router Local Dial Peers Telephone Number 919 555-8282 919 555-9595 Enter the following commands to configure the local ports on the East Router with the dial-peer information in Table East(config)# dial-peer voice 901 pots...
- Page 19 Checking Dial Peer Configuration If you configured POTS dial peers on your router by following these examples, you can place calls between telephones connected to the same router. You can also use the show dial-peer voice command to verify that the data you configured is correct. If the voice port is offline, use the interface configuration no shutdown command to enable it.
- Page 20 Configuring Voice-over-IP Table 10 West Router Remote Dial Peers with Wildcards Remote Location East Construct a table similar to IP addresses, and dial-peer tags. The IP addresses shown in this guide are meant only as examples. When you configure your network, be Note sure to substitute your own IP addresses.
- Page 21 Table 11 East Router Remote Dial Peers with Wildcards Remote Location West Enter the following information on the East router to create the dial-peer configuration given in Table East(config)# num-exp 5... 1408555... East(config)# dial-peer voice 801 voip East(config-dial-peer)# destination-pattern 1408555... East(config-dial-peer)# session target ipv4:192.168.19.27 These commands are summarized in Figure 17...
- Page 22 Configuring Voice-over-IP Figure 18 FXO Gateway to PSTN Source Destination PSTN cloud To create a POTS dial peer for an FXS interface as explained earlier, you enter the complete telephone number of the attached telephone as the destination pattern for incoming calls. However, to create a POTS dial peer for an FXO interface, the destination pattern refers to outgoing calls, and you can include wildcards in it because the PSTN performs the switching.
- Page 23 Checking FXO Configuration If you configured your FXO interface according to this example, you can place outgoing calls over the PSTN. If you have trouble placing calls, use the show voice port command to make sure that the VIC is installed correctly.
- Page 24 Configuring Voice-over-IP Both PBXs in this example use E&M interface Type 2, with four-wire operation and immediate-start signaling. The values for your configuration depend on your PBX and are available from your telecommunications department or the PBX manufacturer. For more information about E&M interface configuration commands, refer to the “VoIP Commands”...
- Page 25 For these commands to take effect, you have to cycle the port by using the shutdown and no shutdown Note commands. Configure the PBX to pass all dual-tone multifrequency (DTMF) signals to the router. Note Configure the East router similar to the West router. The East router connects to the PBX through an E&M VIC port 0/1.
- Page 26 Configuring Voice-over-IP Multilink Point-to Point Protocol (PPP) interleaving • Real-Time Transport Protocol (RTP) header compression • Cisco IOS software provides many other tools for ensuring QoS, such as custom queuing, priority queuing, and weighted fair queuing. For further information and more detailed examples of QoS configuration, refer to the Cisco 1751 Router Software Configuration Guide.
- Page 27 RSVP Resource Reservation Protocol (RSVP) enables routers to reserve enough bandwidth on an interface for reliable and quality performance. RSVP works well on PPP, HDLC, and similar serial line interfaces. It does not work well on multi-access LANs. You should configure RSVP if you have a serial interface and any of the following: Links slower than 2 Mbps •...
- Page 28 Configuring Voice-over-IP Configuring Multilink PPP Interleaving To configure multilink PPP and interleaving on a dialer, ISDN PRI or ISDN BRI interface, or a virtual template, you must first configure multilink PPP and interleaving on the interface or template by entering the following commands in interface configuration mode: Router(config-if)# encapsulation ppp Router(config-if)# ppp multilink...
- Page 29 Configuring Frame Relay for VoIP Configuring VoIP on a Frame Relay link involves certain special considerations to ensure acceptable voice quality. For Frame Relay links with slow output rates (64 kbps or less) and with data and voice being transmitted over the same permanent virtual circuit (PVC), you should configure the following parameters: Lower maximum transmission unit (MTU) size—Voice packets are generally small.
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Page 30: List Of Terms
List of Terms List of Terms This section defines some of the VoIP terms and concepts used in this guide. BRI—Basic Rate Interface, an ISDN interface. CIR—Committed information rate. The average rate of information transfer a subscriber (for example, the network administrator) has stipulated for a Frame Relay PVC. Call leg—A segment of a call path, for instance, between a telephone and a router, a router and a network, a router and a PBX, or a router and the PSTN. -
Page 31: Obtaining Documentation
• Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco Systems Corporate Headquarters (California, USA) at 408 526-7208 or, elsewhere in North America, by calling 800 553-NETS (6387). 78-11259-05 -1 (2147483647) used to identify a dial peer. -
Page 32: Documentation Feedback
You can send comments about technical documentation to bug-doc@cisco.com. You can submit comments by using the response card (if present) behind the front cover of your document or by writing to the following address: Cisco Systems Attn: Customer Document Ordering 170 West Tasman Drive San Jose, CA 95134-9883 We appreciate your comments. -
Page 33: Obtaining Additional Publications And Information
• Cisco Marketplace, the company store, at this URL: http://www.cisco.com/go/marketplace/ The Cisco Product Catalog describes the networking products offered by Cisco Systems, as well as • ordering and customer support services. Access the Cisco Product Catalog at this URL: http://cisco.com/univercd/cc/td/doc/pcat/ Cisco Press publishes a wide range of general networking, training and certification titles. - Page 34 Obtaining Additional Publications and Information iQ Magazine is the quarterly publication from Cisco Systems designed to help growing companies • learn how they can use technology to increase revenue, streamline their business, and expand services. The publication identifies the challenges facing these companies and the technologies to help solve them, using real-world case studies and business strategies to help readers make sound technology investment decisions.