callVariable1 and callVariable2 are configured by the Finesse administrator. The administrator himself sets these variables and the way they should be filled out during the call. The parameters can be under any name.
The parameter that fills in the applicant for the application - the reporter must match the username of the applicant, if there is one in Jira.
If other parameters are also sent from Finesse, then on the task creation screen in Jira, only those parameters will be pre-filled, the names of which correspond to the names of the user fields.