VoIP.tcl

# start new simulation
set ns [new Simulator]

# setup tracing/nam
set tr [open voip.tr w]
set nf [open voip.nam w]
$ns trace-all $tr
$ns namtrace-all $nf

# finish function, close all trace files and open up nam
proc finish {} {

global ns nf tr
$ns flush-trace

close $nf
close $tr

exec nam voip.nam &
exit 0
}

### creating nodes
set node0 [$ns node]

$node0 label "Voz 1"
$node0 color red

set node1 [$ns node]

$node1 label "Voz 2"
$node1 color blue

# creating duplex-link
$ns duplex-link $node0 $node1 256Kb 50ms DropTail
$ns duplex-link-op $node0 $node1 orient right

# setup colors
$ns color 1 Yellow
$ns color 2 Green

## 2-way VoIP connection

#Create a UDP agent and attach it to node0
set udp0 [new Agent/UDP]
$ns attach-agent $node0 $udp0

# set udp0 flowid to 1
$udp0 set fid_ 1

# Create a CBR traffic source and attach it to udp0
set cbr0 [new Application/Traffic/CBR]

$cbr0 set packetSize_ 128
$cbr0 set interval_ 0.020

# set traffic class to 1
$cbr0 set class_ 1
$cbr0 attach-agent $udp0

# Create a Null sink to receive UDP

set sinknode1 [new Agent/LossMonitor]
$ns attach-agent $node1 $sinknode1

# Connect the UDP traffic source to Null sink
$ns connect $udp0 $sinknode1

set udp1 [new Agent/UDP]

$ns attach-agent $node1 $udp1
$udp1 set fid_ 2

set cbr1 [new Application/Traffic/CBR]

$cbr1 set packetSize_ 128
$cbr1 set interval_ 0.020
$cbr1 set class_ 2
$cbr1 attach-agent $udp1

set sinknode0 [new Agent/LossMonitor]

$ns attach-agent $node0 $sinknode0
$ns connect $udp1 $sinknode0
# end of voice simulation setup

# start up traffic
$ns at 0.1 "$cbr0 start"
$ns at 0.1 "$cbr1 start"
$ns at 10.0 "$cbr0 stop"
$ns at 10.0 "$cbr1 stop"
$ns at 10.5 "finish"

# run the simulation
$ns run