Update: Caller

BEGIN {FS="|"; num="10000027"}
{
    if ($4==num) {a[$5]++; b[$5]+=$3}
}

END {
    for (i in a) {
        if (a[i]>max) {
            max=a[i]
            c=i;
        }
    }
    for (i in b) {
        if (b[i]>max2) {
            max2=b[i]
            c2=i;
        }

    }
    print "Caller: "c" called "num" "max" times."
    print "Caller: "c2" called "num" for "max2" seconds."
}