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

<p>As you can see below in the contact the information is present</p>

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

<p>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</p>

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

<p>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</p>

<p><a href="http://tools.ietf.org/html/rfc4579">http://tools.ietf.org/html/rfc4579</a></p>

<p>Thanks</p>

<p>Craig</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">&mdash;<br>Reply to this email directly or <a href="https://github.com/OpenSIPS/opensips/issues/301#issuecomment-52598820">view it on GitHub</a>.<img alt="" height="1" src="https://github.com/notifications/beacon/5479561__eyJzY29wZSI6Ik5ld3NpZXM6QmVhY29uIiwiZXhwaXJlcyI6MTcyNDA1MjI5MiwiZGF0YSI6eyJpZCI6Mzk1NTkwODN9fQ==--7627d41412912a9b66016bc0802d3861fb6a6981.gif" width="1" /></p>