Section 5: Voice (8 Points)

• Use a Hoot and Holler configuration on your voice network so that you do not have to dial the remote phone numbers to make a connection. Use any numbering plan you wish. Configure VoIP in such a way that numerous further phones can be added into the network and these additional phones can join in the conversation automatically as if on a conference call, but without the need to dial any numbers. If you need to add any further networks to achieve this, use an OSPF area of your choice.

NOTE

Ensure you are using a 1700, 2600, 3600, or 3700 voice enabled router for this question.

You might begin thinking that you could use connection plar to make the phone ring without dialing it, but then further on in the question, you have to make additional phones connect as if on a conference call. As you will not have the facility available to set up conference calls with additional equipment, you need to explore how you can make all the phones connect to each other; hopefully, you will search the CD or online connection and find that it is possible to multicast your voice to multiple destinations. Cisco has a feature called Hoot and Holler, which basically emulates the voice technology employed in brokerage firms for traders to communicate with each other in a number of locations; this is available on 1700, 2600, 3600, and 3700 voice-enabled platforms. The configuration is complex with a virtual interface defined for multicast fast switching; routers joining the same session must have their virtual interfaces on different subnets; otherwise, packets are not switched to the IP network. You need to add your virtual interfaces into OSPF and configure your voice ports for trunking as this will be a permanent connection; voice peers are required to multicast your voice. If you have configured this correctly as shown in Examples 2-64 and 2-65, you have scored 8 points.

Example 2-64. R1 VoIP Configuration

 ip multicast-routing ! voice class permanent 1 signal timing oos timeout disabled signal keepalive 65535 ! interface Vif1  ip address 10.1.1.17 255.255.255.240  ip pim dense-mode ! interface Virtual-Template1  ip address 10.100.100.1 255.255.255.240  ip pim dense-mode ! router ospf 30  network 10.1.1.16 0.0.0.15 area 0 ! voice-port 1/0/0  voice-class permanent 1  connection trunk 111 ! dial-peer voice 111 voip  destination-pattern 111  session protocol multicast  session target ipv4:235.035.0.035:22222 

Example 2-65. R4 VoIP Configuration

 ip multicast-routing ! voice class permanent 2 signal timing oos timeout disabled signal keepalive 65535 ! interface Vif1  ip address 10.4.4.9 255.255.255.248  ip pim dense-mode ! interface Virtual-Template1  ip address 10.100.100.3 255.255.255.240  ip pim dense-mode ! router ospf 30 network 10.4.4.8 0.0.0.7 area 2 ! voice-port 1/1/0  voice-class permanent 2  connection trunk 111 ! dial-peer voice 111 voip  destination-pattern 111  session protocol multicast  session target ipv4:235.035.0.035:22222