Symptom:
Conference message isn't showing in DX650 when the called party is in contact list


Conditions:
Steps to reproduce:

 1. Register Dx650 and any other two IP Phones A and B
 2. Add the IP Phone A in Contact list of DX650.
 3. Make a call between two IP Phones A and B 
 4. Make a conference call to DX650 from IP Phone A

Now three Phones are in Conference

Here the issue is the DX650 IP Phone not showing the conference message but the phone is in conference.
If we press the details option we can able to see the conference details. 

Note: If the IP Phone are not in the contact list the DX650 showing the conference message.