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  1. or download this
    to find a SIP packet:
if (packet_string contains the word 'sip' but NOT the word 'sdp') {
    print "packet appears to be sip";
}
  2. or download this
    to find a SDP packet:
if (packet_string contains the word 'sip' and ALSO CONTAINS the word '
+sdp) {
    print "packet appears to be sdp";
}
  3. or download this
    to find an RTP packet:
if (packet_string cotains NEITHER 'sdp and sdp') {
    print "packet appears to be rtp";
}
  4. or download this
    if ($packet !~ m/sip && sdp/) {
    print "packet is RTP\n";
...
 elsif ($packet =~ m/sdp/ && m/sip/) {
    print "packet is sdp!\n";
 }