I just had a client with a UC320 phone system explain this happening to him:
He (client) was on the phone talking with a restaurant and making a reservation. Another party (a plumber) had called the office main #, got the AA, and entered my client's extension #. When my client was done making the reservation, he picked up the call from the plumber, and the plumber said he was able to hear the conversation between my client, and the restaurant combined with the ring tone.
This site is running 2.3.2(6). They have only a SIP trunk, no FXO ports are being used.
How the heck does THAT happen??? I'd say my client pressed something funny on his handset, but the plumber hear the convo overlaid with the ring tone, so I doubt there is anything someone should be able to press on the phone to cause THAT.
