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.
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. • Information the router displays on the console screen is in screen • Information that you enter at the CLI is in boldface screen font. font.
Installing WAN and Voice Interface Cards Figure 1 Voice Interface Card SEE MANUAL BEFORE INSTALLATION 0 10695 1 IN USE VIC E&M IN USE VIC ports You should install and cable VICs before performing the software configuration tasks explained later in this guide. Warning Caution Be sure to observe all warnings and safety precautions in the installation guide. VICs do not support online insertion and removal (hot swap).
Installing WAN and Voice Interface Cards Cisco 1750 SLOT 2 SLOT 1 OK SLOT 0 OK VIC 2FXO CONS SLOT 0 OLE 1 SEE IN USE Model SLOT 1 46565 Inserting a WIC or VIC in the Router IN USE Figure 2 MA NUAL BEFO RE INS THIS SLOT ACCEPT ONLY S VOICE INTERF CAR ACE DS TALLA TIO FDX N 100 0 LINK 10/100 ETHE RNET VIC 2FXS IN USE AUX SEE IN USE 1 MA NUAL BEFO RE Guides INS TALLA TIO N PVDM OK MOD OK SLOT 2 OK 0 +5, +12, -12 VDC Interface card If you need more detail
Installing WAN and Voice Interface Cards Figure 3 Connecting VICs to the Network 1 IN USE IN USE FXS VIC VIC FXS SEE MANUAL BEFORE INSTALLATION 0 SEE MANUAL BEFORE INSTALLATION 0 1 PBX IN USE IN USE E&M VIC VIC E&M SEE MANUAL BEFORE INSTALLATION 0 10691 1 IN USE IN USE FXO VIC VIC FXO When you are finished, reinstall any network interface cables you removed and turn on power to the router.
Installing WAN and Voice Interface Cards Figure 5 shows the wiring pattern for an E&M connector, and Table 2 lists the E&M pinouts. The E&M VIC pinout depends on the PBX type and connection. Pins that are not used should not be connected.
Installing WAN and Voice Interface Cards The card is illustrated in Figure 6. Figure 6 2-Port ISDN BRI Card Front Panel B1 B2 OK VIC 2B-NT/TE SEE MANUAL BEFORE INSTALLATION ISDN BRI S/T 1 ISDN BRI S/T 0 51075 RJ-45 ports 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.
Installing WAN and Voice Interface Cards Note When the interface is configured as NT and is connecting to a TE device, the cable must have the transmit and receive pins swapped (crossover cable). (See Table 3.
Security Device Manager Cisco 1751 Router Slot Numbering VIC slot 2 Model Cisco 1751 SLOT 2 SLOT 1 1 SEE MANUAL BEFORE INSTALLATION 0 VIC 2FXO Power switch IN USE Console port IN USE VIC 2FXS IN USE Kensington-compatible WIC/VIC slot 1 locking socket IN USE Figure 8 THIS SLOT ACCEPTS ONLY VOICE INTERFACE CARDS 1 SEE MANUAL BEFORE INSTALLATION 0 CONSOLE SLOT 1 OK SLOT 0 OK Slot 1 OK LED FDX Slot 0 OK LED 100 LINK PVDM OK AUX 10/100 ETHERNET SLOT 2 OK +5, +12, -12 VDC 10/100-Mbps E
Configuring Voice-over-IP 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. (See Figure 10.) This guide describes the configuration tools and the major configuration tasks to configure the router.
Configuring Voice-over-IP Cisco IOS Command-Line Interface To configure your router from the command-line interface (CLI), refer to this guide, the Cisco 1700 Series Software Configuration Guide, or the Cisco 1751 Router Software Configuration Guide available on the Documentation CD-ROM. Major Voice over IP Configuration Tasks Follow these major steps to configure Voice over IP (VoIP) on your router: Step 1 Configure your IP network to support real-time voice traffic.
Configuring Voice-over-IP 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. Note VoIP requires one of the following IOS Release 11.3(1)T (or later) feature sets: IP Plus, Desktop Plus, or Enterprise Plus. Follow these steps to enter configuration mode: Step 1 Connect a terminal or PC to the router.
Configuring Voice-over-IP Note Voice configuration uses a number of Cisco IOS commands. For complete information about these commands, refer to the Cisco 1751 Router Software Configuration Guide. You can also enter a question mark after a command or partial command at the Router(config)# prompt to get syntax and argument help. Note At any point, you can see the operating configuration, including changes you just made, by entering the show running-config command.
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. Area codes are assigned geographically, office codes are assigned to specific switches, and station codes identify a specific port on that switch.
Configuring Voice-over-IP Table 5 Sample Number Expansion Table Extension Destination Pattern Num-Exp Command Entry 3737 14085553737 num-exp 3737 14085553737 To expand 3737 to 14085553737 .... 1408555.... num-exp .... 1408555.... To expand any dialed sequence of four digits (represented by four periods) by prefixing 1408555 to it 5.... 1408555.... num-exp 5.... 1408555....
Configuring Voice-over-IP Note You can name your router by using the global configuration hostname command. Table 6 lists telephone numbers and voice ports for the West router. (For information about port numbering, refer to the section on “Determining Voice Port Numbering” earlier in this guide.
Configuring Voice-over-IP Note The telephone numbers used in this guide are only examples and are invalid for public use in the United States. When you configure your network, be sure to substitute your own telephone numbers.
Configuring Voice-over-IP Figure 13 Basic Voice Network (East Router) 919 555-8282 FXS VIC 1/0 IP cloud East 919 555-9595 Table 8 22333 FXS VIC 1/1 East Router Local Dial Peers Telephone Number Destination Pattern Voice Port Dial-Peer Tag 919 555-8282 19195558282 1/0 901 919 555-9595 19195559595 1/1 902 Enter the following commands to configure the local ports on the East Router with the dial-peer information in Table 8: East(config)# dial-peer East(config-dial-peer)# East(config-dial-
Configuring Voice-over-IP 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. Note If the voice port is offline, use the interface configuration no shutdown command to enable it.
Configuring Voice-over-IP Create a VoIP dial peer on the West router for every telephone on the East router, all associated with the same IP address. But it is much easier to use periods as wildcards, as shown in Table 10. Table 10 West Router Remote Dial Peers with Wildcards Remote Location Telephone Number Destination Pattern IP Address Dial-Peer Tag East 919 555-xxxx 1919555.... 192.168.11.
Configuring Voice-over-IP Table 11 East Router Remote Dial Peers with Wildcards Remote Location Telephone Number IP Address Dial-Peer Tag West 408 555-xxxx 192.168.19.27 801 Enter the following information on the East router to create the dial-peer configuration given in Table 11: 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.
Configuring Voice-over-IP FXO Gateway to PSTN Source FXS VIC 0/0 West Destination PSTN cloud IP cloud FXO VIC 1/0 dial-peer voice 201 pots destination-pattern 9 port 0/0 51077 Figure 18 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.
Configuring Voice-over-IP 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. Use the show dial-peer voice command to make sure that the data you configured is correct, and test the PSTN by connecting a handset directly to the PSTN outlet and placing a call.
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” chapter of the Cisco 1751 Router Software Configuration Guide.
Configuring Voice-over-IP Note For these commands to take effect, you have to cycle the port by using the shutdown and no shutdown commands. Note Configure the PBX to pass all dual-tone multifrequency (DTMF) signals to the router. Configure the East router similar to the West router. The East router connects to the PBX through an E&M VIC port 0/1.
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. Note QoS measures the level of network performance.
Configuring Voice-over-IP 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.
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 Router(config-if)# ppp multilink interleave Optionally, configure a maximum fragment delay: Router(config-if)#
Configuring Voice-over-IP 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.
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. Each call leg corresponds to a dial peer.
Obtaining Documentation RTP—Real-Time Transport Protocol, a network protocol used to carry audio and video packet traffic over an IP network. session target—A remote IP or DNS address specified for a dial peer. tag—A positive integer in the range 1 to 231 -1 (2147483647) used to identify a dial peer. UDP—User Datagram Protocol, a simple protocol that exchanges datagrams without acknowledgments or guaranteed delivery. VIC—Voice interface card.
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