Cisco Systems CISCO1751 quick start RTP Header Compression, Configuring Multilink PPP Interleaving

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Configuring Multilink PPP Interleaving

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)#ppp multilink fragment-delay milliseconds

You can also reserve a special queue for real-time packet flows to specified destination User Datagram Protocol (UDP) ports, allowing real-time traffic to have higher priority than other flows. You need the following command only if you have not configured RSVP:

Router(config-if)#ip rtp reserve lowest-UDP-port range-of-ports

For virtual templates only, apply the virtual template to the multilink bundle:

Router(config-if)#multilink virtual-template 1

To create a virtual template interface, enter the following interface virtual-templateglobal configuration command:

Router(config)# interface virtual-template 1

RTP Header Compression

RTP header compression on a PPP, HDLC, or similar serial interface compresses the packet header to reduce network overhead.

You should configure RTP header compression on a serial interface if you have either of the following:

Links slower than 2 Mbps

Need to save bandwidth

Note Do not use RTP header compression on links faster than 2 Mbps.

Configuring RTP Header Compression

Enable RTP header compression at both ends of the serial link by entering the following ip rtp header-compressioninterface configuration command:

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

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

Cisco 1751 Voice-over-IP Quick Start Guide

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Contents Installing WAN and Voice Interface Cards, page Configuring Voice-over-IP, page List of Terms, pageAudience Audience, page Conventions, pageIf You Are Installing Voice Interface Cards Installing WAN and Voice Interface CardsConventions WIC and VIC Installation Procedure Connecting the FXS, FXO, and E&M VICs to the Network Figure 2 Inserting a WIC or VIC in the RouterConnector Pinouts for FXS, FXO, and E&M VICs SignalChecking FXS VIC Installation 2-Port ISDN BRI CardDescription RJ-48S Wiring for E&M ConnectorsConnecting the 2-Port ISDN BRI Card Determining Voice Port Numbering ISDN BRI Card LEDsNT Interface use TE Interface useCisco Router and Security Device Manager ExampleConfiguration Tools Configuring Voice-over-IPCisco ConfigMaker Application Major Voice over IP Configuration Tasks Cisco IOS Command-Line InterfaceEntering Configuration Mode Information for International UsersSaving the Configuration Router# show startup-configWildcards and Number Expansion Dial PlanWestconfig-dial-peer# port 0/0 Configuring FXS Interfaces Num-Exp Command EntryDestination ExtensionLocal Dial Peers Telephone NumberVoice Port Dial-Peer TagThese commands are summarized in Figure Destination Pattern Figure 14 East Router Configured for Local Dial PeersFigure 13 Basic Voice Network East Router 919 FXS VIC 1/0Checking Dial Peer Configuration Calling Between RoutersRemote Location Destination Pattern1919555 Configuring FXO Interfaces Checking FXS ConfigurationOther Routers on the Network Remote LocationFigure 18 FXO Gateway to PSTN WestConfiguring E&M Interfaces Checking FXO ConfigurationCommand signal wink-start immediate delay-dialFigure 20 Linking PBXs over the IP Network Remote Dial Peers Tuning Parameters for Real-Time Voice Traffic Checking E&M Interface ConfigurationNeed for Quality of Service IP PrecedenceRSVP Configuring RSVPMultilink PPP Interleaving Configuring Multilink PPP Interleaving Configuring RTP Header CompressionRouterconfig-if# ip rtp reserve lowest-UDP-port range-of-ports RTP Header CompressionConfiguring Frame Relay for VoIP List of Terms Cisco.com Obtaining DocumentationOrdering Documentation Submitting a Service Request Documentation FeedbackObtaining Technical Assistance Cisco Technical Support WebsiteDefinitions of Service Request Severity Obtaining Additional Publications and InformationiQ 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. You can access iQ Magazine at this URL