Siebel CTI automatically creates activity

Hello,

I have requirement to automatically create activity with CTI. I'm using EventDisconnected event. The tricky thing is that I need to associate the new automatically created Activity with call center agent context data.

For example:

1) Call center agent picks up phone

2) Caller is automatically identified or not by using phone number

3) Agent opens existing Service Request

4) Call is ended

5) Activity is automatically created and linked with Service Request from step 3.

I don't know how to create automatically link with the existing SR. Is it possible to pass SR Row Id through user properties to CTI event handler? Maybe some one has some ideas how to create necessary link automatically?