Hi Guys, I am working on a .net ESL host (inbound mode) and connect to the ESL using ESLConnection. Now I am trying to originate a call using the ESLConnection.Api() function. But it does't work as expected. It always returns: === Content-Type: api/response Content-Length: 125 Content-Length: 125 -USAGE: <call url> <exten>|&<application_name>(<app_args>) [<dialplan>] [<context>] [<cid_name>] [<cid_num>] [<timeout_sec>] === But I am pretty sure my string is right: {origination_caller_id_number=31341.....,origination_caller_id_name=31341......}sofia/external/31634258...@xxx.xxx.xxx.xxx I also tried with double {{ and }} but same result. Even if I take out the whole {} string and just use "sofia/external/etc.." I get the same message back. My code: ESLconnection eslDial = new ESLconnection("x.x.x.x", "8021", "x"); if (eslDial.Connected() == ESL_SUCCESS) { // Create a uuid used to identify the b-leg. string legb_uuid = eslDial.Api("create_uuid", "").GetBody(); string cDialString = "{{origination_uuid=" + legb_uuid + ",origination_caller_id_number=" + thisAni + ",origination_caller_id_name=" + thisAniName + "}}sofia/external/" + thisDestination; // Send the command var eslEvent = eslDial.Api("originate", cDialString); // Write the result to the console Console.WriteLine(eslEvent.Serialize(string.Empty)); return true; } Thanks for your help!, Regards, Michael Lutz