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Configuring the IP Network for Real-Time Voice Traffic<br />

Configuring Multilink PPP Interleaving<br />

To configure multilink PPP and interleaving on a dialer, ISDN PRI, or ISDN BRI interface, or a<br />

virtual template, you must first configure multilink PPP and interleaving on the interface or template<br />

by entering the following commands in interface configuration mo<strong>de</strong>:<br />

14 Voice over IP Quick Start Gui<strong>de</strong><br />

Router(config-if)# encapsulation ppp<br />

Router(config-if)# ppp multilink<br />

Router(config-if)# ppp multilink interleave<br />

Optionally, configure a maximum fragment <strong>de</strong>lay:<br />

Router(config-if)# ppp multilink fragment-<strong>de</strong>lay milliseconds<br />

You can also reserve a special queue for real-time packet flows to specified <strong>de</strong>stination UDP <strong>port</strong>s,<br />

allowing real-time traffic to have higher priority than other flows. This command is nee<strong>de</strong>d only if<br />

you have not configured RSVP:<br />

Router(config-if)# ip rtp reserve lowest-UDP-<strong>port</strong> range-of-<strong>port</strong>s<br />

For virtual templates only, apply the virtual template to the multilink bundle:<br />

Router(config-if)# multilink virtual-template 1<br />

Do You Need RTP Hea<strong>de</strong>r Compression?<br />

RTP hea<strong>de</strong>r compression on a PPP, HDLC, or similar serial interface compresses the packet hea<strong>de</strong>r<br />

to reduce network overhead.<br />

You should configure RTP hea<strong>de</strong>r compression on a serial interface if you have either of the<br />

following:<br />

• Links slower than 2 Mbps<br />

• Need to save bandwidth<br />

Note Do not use RTP hea<strong>de</strong>r compression on links faster than 2 Mbps.<br />

Configuring RTP Hea<strong>de</strong>r Compression<br />

Enable RTP hea<strong>de</strong>r compression at both ends of the serial link by entering the following command<br />

in interface configuration mo<strong>de</strong>:<br />

Router(config-if)# ip rtp hea<strong>de</strong>r-compression

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