As an introduction of API there is an article Introduction to Sippy XML-RPC API
Regarding provided code - it seems, it can not work directly, but via appropriate API service (methods) only. URL to access the service is like https://<YOUR_SWITCH_IP>/xmlapi/xmlapi
Let the developers of Softswitch correct my answer, if I wrong, please
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If anyone has a solution plz share the syntax code, I making a solution but it's not working, I attach a file of my solution but its not working