Hi
I have tested the new function added to the topology_hiding
I added the following to the dialog settings in the opensips.cfg
modparam("dialog", "th_passed_contact_params", 
"confid;+com.avistar.confapi.v1;isfocus")

As you can see below in the contact the information is present

Contact: 
<sip:108.60.100.184:5060;transport=tcp;confid=3FD99511F9EB238C3FE825FF752847D1>;+com.avistar.confapi.v1;isfocus.

After the topology hiding you see that the confid has now been passed and is 
fine, but the SIP conferencing UA is still not working at it requires the last 
two params that have been sent

Contact: 
<sip:64.62.166.180;transport=tcp;did=481.0964f035;confid=3FD99511F9EB238C3FE825FF752847D1>.

According to the RFC4579 the isfocus is a valid param, could modify the fix to 
allow these other forms of params to be passed if the exist ie 
;+com.avistar.confapi.v1;isfocus

http://tools.ietf.org/html/rfc4579

Thanks

Craig

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