How to alter the CONTACT header in 200 OK response?

Hi,         I am new member of this group, In our concern we
are developing conference service which supports Tightly
Coupled Conference. We are using BEA Weblogic SIP server
(WLSS) 2.2.0 and JSR 116 standards for SIP Servlet.
         Following steps are for creation of conference.
         1) Conference server shall receive INVITE request
from user.
         2) Create 200 OK response message with:
          a) Unique Conference-Id 
          b) Append "isfocus" parameter in Contact
header field.
         3) Finally, send 200 OK response to the user.
           We are facing a problem in step 2(b) while trying
to alter the contact header field. WLSS container does not
allow adding "isfocus" parameter in contact
header. 
            Is there any other SIP Server which support to
add "isfocus" parameter in Contact header? 
       OR 
       Any other way to send "isfocus" to the
user?
         Please provide your valuable suggestion on this.
    Thanks in advance.
    Regards,
  Janakiraman

  

 
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