McDewey

Quality of Service for Voice over IP VoIP QoS over Leased Lines (Using PPP) 32 QoSVoIP.mif VoIP QoS over Leased Lines (Using PPP) This section describes how to configure VoIP in a typical network where low speed WAN links are used to carry both data and voice traffic. It includes the following subsections: • VoIP over Leased Line (Using PPP) Scenario • VoIP over Leased Line (Using PPP) Recommended Solution VoIP over Leased Line (Using PPP) Scenario A typical application of VoIP is for a large corporation to use its existing WAN infrastructure for data traffic to carry voice calls between its headquarters and its branch offices. Figure 9 shows a typical VoIP network environment where low speed WAN links are being used to carry both data and voice traffic. dial-peer voice 100 pots destination-pattern 2...... no digit-strip direct-inward-dial port 1/0:23 ! dial-peer voice 300 voip destination-pattern 3...... session target ipv4:10.77.39.129 req-qos guaranteed-delay acc-qos guaranteed-delay ! line con 0 line aux 0 line vty 0 4 In this example, access list 101 matches H.323 signaling traffic to and from TCP port 1720. This traffic is placed into class h323, which is guaranteed 96 kbps of bandwidth using LLQ. Voice payload is given priority using the RSVP configuration. Configuration Example 14: RSVP Support for LLQ + QoS for Signaling Traffic