JSON message about configuration capability of voice prompt
{ "voicePromptCfg":{ "callPrompt":{ /*optional, voice prompt for calling*/ "@min":1, "@max":2 }, "rejectPrompt":{ /*optional, voice prompt for rejection*/ "@min":1, "@max":2 }, "voiceTalkStopPrompt":{ /*optional, end voice prompt for two-way audio*/ "@min":1, "@max":2 } } }