| 摘要 |
A process and a system are disclosed for detecting activity, e.g., three way calling, call forwarding, or the like, during a phone call. The process includes, and the system is configured for, establishing the call path between a first party and a second party, adding a reference tone to the call path, observing a reflected tone from the call path, and determining a relationship between the reference tone and the reflected tone. Information relating to the relationship may be reported for further analysis. |
