Hi , I am trying to create 3-way call . 
At this moment I am setp 3 instances of SIP Ins ,for making and receiving calls.
A,B,C - A party is the 3-way intiator
A calls B
B accepts the call
A puts B on hold 
A calls C   --->can I change the values inside the script for the same user agent already in call with B ?  
Thanks
Sanjeeb