This feature allows you to speak with five to six people at the same time from wherever you are. It is just perfect for times when teamwork matters so much to job success. You can have a conference with either cellular or landline phones including STD and ISD calls. All calls will have to be initiated by you. All your calls will be charged the Airtime and DoT charges as applicable to ensure of this service, you need a call conference compatible handset.   

How to do  
To initiate a Conference Call while you are in conversation with one: 

Put the existing line on hold  
Press Options/Menu  
Choose 'New Call'  
Dial the number of the third person  
Then choose conference option  
when the 2nd caller comes on line 
Answer the second call  
Press Options/Menu  
Choose 'Conference'  
Now the 3 of you are in conference  

Repeat the same procedure to bring 4th, 5th and 6th person into conferencing