Hi Jules,
Feels a bit weird when the facility of silent monitoring or "Barge In" feature gives the customer much more flexibility than going to hard wire the cables. A small demo to the customer should turn him around to use these features.
Anyways, to answer your question, the only thing I can think of is by spanning the switch port to another, hook a laptop to that port and capture the traffic by using a Sniffer or Wireshark tool. You can also use a Hub between the phone and switchport (provided the phone gets power from a power brick and cannot use PoE). A third alternative is to span the switchport behind the phone and connect the laptop/PC with the wireshark/sniffer tool.
There are two drawbacks:
1.) The audio will not be realtime. The customer has to capture the entire traffic before he/she can listen to it.
2.) If the phones are usign SRTP (secure RTP), then this will be more painful since you will have to decrypt the RTP stream before listening to it.
This link lets you know how to listen to the captured RTP stream.
http://wiki.brekeke.com/wiki/Listen-to-call-with-Wireshark?PHPSESSID=8bbf1ba8f60045c0ae86acfaf0210262
Not aware if there is any other RJ 45 cable splitter that can be used to split voice traffic because ideally we are speaking about conferencing three parties into a same call. And conferencing requires conference resources to be invoked.
Regards,
Arun Kumar
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