How to record audio between Mitel IP Handsets Contents Contents ................................................................................................................................... 1 Introduction.............................................................................................................................. 2 3300 Preparation...................................................................................................................... 3 Network Preparation ............................................................................................................... 4 Wireshark ................................................................................................................................. 5 Data Collection ....................................................................................................................................5 Analysis .............................................................................................................................................10 How to record audio between Mitel IP Handsets 1 Introduction This document is to provide an engineer with clear instructions on how to; 1/. Use Wireshark to capture data streams between Mitel handsets on post Release 8.0 Systems 2/. How to turn the captured data streams into an audio file which can then be played back using Windows Media Player. This gives the engineer a file to listen to in order to judge the quality of the call etc. Additionally (on page 14) there is a wealth of diagnostic information available including; 1). Maximum Delta (Latency) 2). Maximum Jitter 3). Mean Jitter 4)/ Lost Packets 5). The clock drift between the two hosts All in all giving the engineer a good measure of the quality of the call How to record audio between Mitel IP Handsets 2 3300 Preparation 1/. Log on to your 3300 2/. Browse to System Options -> System Options Assignment. 3/. Click on Change and set ‘Voice Encryption Enabled’ to ‘No’. 4/. Save and close down your browser. How to record audio between Mitel IP Handsets 3 Network Preparation 1/. Configure a monitoring port on a network switch and select the ports to be monitored. OR A hub could be placed between the handset and the network port and the laptop could be plugged into the hub. How to record audio between Mitel IP Handsets 4 Wireshark Data Collection 1/. Attach the Laptop to monitoring port (or hub). 2/. Select the interface that Wireshark shout use to capture packets. This is the first icon below the word file or ‘Interface List’ on the screen below If you are given a list of interfaces then generally you want the one with the largest increasing number below the word packets How to record audio between Mitel IP Handsets 5 3/. Next we want to sort out our capture options Click on ‘Capture Filter’ How to record audio between Mitel IP Handsets 6 4/. We are going to create a filter called ‘Mitel Voice’ The required filter string is; udp portrange 50000-50511 This is because; FUNCTION IP Sets - Voice B1/B2, Rx pre release 8.0 IP Sets - Voice B1/B2, Tx pre release 8.0 IP Sets - Voice B1/B2, Rx post release 8.0 IP Sets - Voice B1/B2, Tx post release 8.0 SOCKET NUMBER RTP/UDP 9000/9002 RTP/UDP 9000/9002 RTP/UDP 50000-50511 RTP/UDP 50000-50511 And we are collecting data from a post release 8.0 system Click on ‘OK’ Click on ‘Start’ How to record audio between Mitel IP Handsets 7 5/. At this point NOTHING should appear in the Wireshark screen until someone starts talking on a Mitel handset. The above trace does not capture ‘Ring’ or ‘Busy’ signals which are transmitted using a different protocol; all we are capturing is the voice part of the conversation. How to record audio between Mitel IP Handsets 8 6/. Once conversations start to take place across the network we will start to collect data. Once we have sufficient data press ‘Stop the running live capture’ (fourth icon in from the left) then the data can be saved for later analysis. How to record audio between Mitel IP Handsets 9 Analysis 1/. Go to Analyse -> Decode As How to record audio between Mitel IP Handsets 10 You should then see a screen similar to this; On the left select ‘Decode’ In the centre select ‘both’ On the right scroll down and find RTP Click ‘Apply’ Click ‘OK’ How to record audio between Mitel IP Handsets 11 2/. Go to Telephony -> RTP -> Show All Streams How to record audio between Mitel IP Handsets 12 3/. You should then get a screen similar to this; The forward stream is selected with a left mouse click while The reverse stream is selected with [Shift] + left mouse click If you are unsure which streams go together use the ‘Find Reverse’ Button. When both streams are selected they will appear above the row of buttons Click on ‘Analyse’ How to record audio between Mitel IP Handsets 13 4/. You should new see a screen similar to this; With the reverse like this Click on ‘Save Payload’ How to record audio between Mitel IP Handsets 14 5/. Click on ‘Save Payload’ Name the file (suffix = .au) Select a folder to save the file in Set the format to ‘au’ Set Channels to ‘Both’ Click ‘OK’ Click ‘Close’ How to record audio between Mitel IP Handsets 15 6/. .au files can then be opened with windows media player or similar programs. NOTE Do not forget to turn security back on the Mitel 3300. How to record audio between Mitel IP Handsets 16