Cisco Systems v1.0 Verify Connectivity and IP Phones, Configuring AutoQoS on Cisco IOS Routers

•Configure the command to implement AutoQoS for VoIP

•Examine the results of implementing AutoQoS for VoIP

Step 1 Verify Connectivity and IP Phones

a.This lab requires that two pods be used and both pods are functional. Ensure that an IP phone from one pod can call an IP phone on the other pod.

b.Does the phone call work from one pod to the other? If not, perform appropriate troubleshooting.

__________

c.Have one pod partner slowly count from one to 10 while one or two phone connections are made.

d.How is the voice quality? _______________________________________________________

e.From the lowest numbered pod router, do an extended ping to the other router with a packet size of 1500 bytes. Refer to IP Telephony Table 1 for a list of IP addresses

CMERouterX# ping

Protocol [ip]: <Enter>

Target IP address: <ip_address>

Repeat count [5]: 1000

Datagram size [100]: 15000

Timeout in seconds [2]: <Enter>

Extended commands [n]: <Enter>

While the ping is occurring, place at least one phone call from one pod to another. Multiple calls can be made. Have one pod partner slowly count from one to 10 while the phone connection is active.

f.How is the voice quality? ______________________________________________________

g.Stop the ping by pressing CTRL+Shift+6 or wait for the ping to finish.

h.Display and examine the running configuration of the CME router.

Step 2 Configuring AutoQoS on Cisco IOS Routers

a.Set the clock rate on the DCE serial link between the two router pods to 72000.

CMERouterX(config-if)# clock rate 72000

b.On both CME routers in dial peer configuration mode, set the codec to the G.711 u-law (pronounced myoo (like the greek leter) law) standard. Codec stands for coder/decoder. The defined codec is the set of rules for converting analog signals to digital and vice versa. The two main types of codecs used are G.711 and G.729. G.711 encodes audio on a 64kbps channel. G.729 encodes audio on a 8kbps channel. G.711 and G.729 come in two different types: a-law and u-law. A-law is used with international circuits and u-law is used with U.S. circuits.

CMERouterX(config)# dial-peer voice 6 voip (CMERouterX(config-dial-peer)#codec g711ulaw

c.From the lowest numbered pod router, do an extended ping to the other router with a packet size of 1500 bytes. Refer to IP Telephony Table 1 for a list of IP addresses

CMERouterX# ping

Protocol [ip]: <Enter>

118 - 165 IP Telephony v1.0 Lab 7.1.1 Copyright ♥ 2005, Cisco Systems, Inc.