Cisco Systems 1760 Obtaining Documentation, Cisco.com, Frame Relay Configuration for VoIP

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Note When you enter the show running-configcommand, the format of the ip rtp header-compressioncommand changes to ip rtp header-compressioniphc-format.

Frame Relay Configuration 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. If you decrease the MTU size to 300 bytes, large data packets can be broken up into smaller data packets that are more easily interleaved with voice packets.

The following example configures an MTU size of 300 bytes over serial interface 0/0:

Router# interface serial 0/0

Router(config-if)# mtu 300

Note Lowering the MTU size affects data throughput speed.

Resource Reservation Protocol (RSVP)—Configure RSVP on subinterfaces (which correspond to PVCs) to reserve bandwidth for voice channels. Refer to the “Configuring RSVP Support for Frame Relay” chapter in the

Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.2.

The following example configures RSVP over serial subinterface 0/0.1:

Router(config-if)#interface serial 0/0.1 point-to-point

Router(config-if)#ip address 192.168.19.0 255.0.0.0

Router(config-if)#ip rsvp bandwidth 48 48

RTP header compression—Configure RTP header compression on the subinterfaces to minimize the size of the voice packet. See the “Real-Time Transport Protocol Header Compression” section on page 33.

The following command configures RTP header compression on the selected subinterface:

Router(config-if)#frame-relay ip rtp header-compression

Traffic shaping—Use traffic shaping to control the outbound traffic rate; otherwise, voice packets can be discarded. In Cisco IOS Release 12.0T, Frame Relay traffic shaping is not compatible with RSVP. Use generic traffic shaping instead, and set the committed information rate (CIR) equal to the port speed. This prevents the router from exceeding the CIR rate and discarding the frames.

The following command configures generic traffic shaping with a CIR of 32000 bps:

Router(config-if)#traffic-shape rate 32000

For further information and more detailed examples of Frame Relay configuration, refer to the Cisco 1751 Router Voice-over-IP Configuration Guide.

11Obtaining Documentation

Cisco documentation and additional literature are available on Cisco.com. Cisco also provides several ways to obtain technical assistance and other technical resources. These sections explain how to obtain technical information from Cisco Systems.

Cisco.com

You can access the most current Cisco documentation at this URL:

http://www.cisco.com/univercd/home/home.htm

You can access the Cisco website at this URL:

http://www.cisco.com

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Contents Cisco 1760 Modular Access Router Cabling and Installation Replacement, Repair, or Refund Policy for Hardware Cisco One-Year Limited Hardware Warranty TermsDuration of Hardware Warranty To Receive a Return Materials Authorization RMA NumberMounting the Router in a Rack Parts ListOverview Product Serial Number LocationAttaching Brackets to the Router Bracket Mounting PointsAttaching Brackets to the Rack Attaching the Optional Cable GuideInstalling WIC/VIC Cards Safety InformationCard Installation Removing a WIC or VIC Slot CoverConnecting the Router to Your Local Network Voice Port VerificationPower supply is designed to work with TN power systems Connect Power and Verify InstallationDocument that came with the router Connecting the Power Supply StepConnecting the Console Cable to the Router Connect a PC to the Router Console PortPerform Initial Configuration Initial Configuration Using Cisco CLI-Manual ConfigurationVerifying the Initial Configuration Saving the Configuration Use the CLI to Configure VoIPInformation for International Users Configuring a Dial Plan Configuring the Fast Ethernet InterfaceCommand Purpose Configuring Voice Interface Cards Wildcards and Number ExpansionConfiguring FXS Interfaces Shows a typical VICTelephone Number Voice Port Local Dial PeersVoice Port Dial-Peer Tag FXS VIC Calling Between Routers Checking the Local Dial Peer ConfigurationDestination Pattern Voice Port Dial-Peer Tag Remote Location Destination Pattern IP Address Dial-Peer TagOther Routers on the Network IP Address Dial-Peer TagConfiguring FXO Interfaces Checking the Remote Dial Peer ConfigurationChecking the FXO Configuration Configuring E&M InterfacesCommand Task Linking PBXs over the IP Network Remote Dial Peers Configuring Isdn BRI NT/TE Interfaces Checking the E&M ConfigurationTurning the Line Power On/Off Configuring the BRI LayerConfiguring the Isdn Protocol Setting the Network Clock PriorityConfiguration Example Command DescriptionConfiguring did Interfaces Debugging CommandsVerifying did Voice Port Configuration Configuring a Voice Port to Support didPrerequisites Configuring Quality of Service IP Precedence Configuring LLQLow Latency Queuing Multilink PPP with Link Fragmentation Interleave Configuring Mlppp with LFIConfiguring RTP Header Compression Real-Time Transport Protocol Header CompressionObtaining Documentation Frame Relay Configuration for VoIPCisco.com Documentation DVD Documentation FeedbackCisco Product Security Overview Ordering DocumentationObtaining Technical Assistance Reporting Security Problems in Cisco ProductsCisco Technical Support Website Definitions of Service Request Severity Submitting a Service RequestObtaining Additional Publications and Information Page Page USA
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1760 specifications

The Cisco Systems 1760 series routers are part of Cisco’s popular line of integrated services routers, designed primarily for small to medium-sized businesses and branch offices. The 1760 series was introduced to provide robust connectivity and routing solutions that facilitate secure and reliable networking. Aimed at offering flexibility, these routers integrate multiple functionalities to enhance operational performance.

One of the main features of the Cisco 1760 router is its modularity. It supports various interface and service modules that allow for customization based on specific networking needs. This modular design enables businesses to expand their networking capabilities over time without necessitating a complete hardware overhaul. The router typically comes equipped with two WAN slots and numerous interface options, including Fast Ethernet and serial interfaces.

The 1760 series routers also support advanced security features, providing businesses with a secure environment for their data transmissions. Built-in firewall capabilities, along with support for Virtual Private Network (VPN) protocols, ensure that sensitive information remains protected. Furthermore, the integration of IPsec and MPLS security features assists organizations in maintaining secure and scalable connections across diverse networks.

Another characteristic of the Cisco 1760 is its support for various technologies, including Quality of Service (QoS). QoS functionality allows network administrators to prioritize traffic, ensuring that critical applications receive the bandwidth they require while minimizing latency. This ability is particularly valuable in environments where voice, video, and essential data applications compete for resources.

The router’s ease of management is also noteworthy. With Cisco’s IOS (Internetwork Operating System), the 1760 provides a user-friendly interface allowing for straightforward configuration and monitoring. The simplicity in managing the network devices helps reduce the burden on IT personnel and enhances overall operational efficiency.

Further enhancing the router’s capabilities is its support for voice over IP (VoIP) applications, making it an ideal choice for organizations looking to implement modern telephony solutions. The ability to support multiple voice channels while maintaining adequate data throughput positions the 1760 as an attractive option for businesses transitioning to unified communications.

In summary, the Cisco Systems 1760 series routers exhibit a harmonious blend of modularity, robust security, traffic management, and VoIP support. They effectively meet the demands of modern networking environments, making them a reliable choice for organizations aiming to streamline operations while ensuring secure connectivity. With their adaptable design, these routers can serve as a powerful backbone for enterprise networking needs.