Call Progress Detection (CPD)

You must enable the answering machine connection for user-terminated scenarios with Call Progress Detection (CPD) capability. This feature is tied to SIP Server and MSML Service.

Enable CPD in your SIP Server

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1. Edit your SIP Server Application, and set TServer/am-detected = connect.
2. Enable MSML, which is required so SIP Server can communicate with GVP as a Media Server to delegate outbound calls, play treatments, and CPD.
   • TServer/msml-support=true
   • TServer/refer-enable=true