Because in this case we are talking to a SIP Video Conferencing Services, it 
creates two sets of Custom Params, the first is a confid= which is a refence 
for the MCU for the current conference session, as stated above 
confid=3FD99511F9EB238C3FE825FF752847D1, the second part which is standard for 
all SIP conferencing services is they pass a isfocus as part of the Header that 
allows conference-aware user agent that supports the conferencing call control 
conventions

But as you see with this MCU it passes a couple of params in the contact header 
;+com.avistar.confapi.v1;isfocus which are outside the <> and the config= that 
is inside the <> for the UAC to function it needs to receive all this 
information, from what i can see this is a typical method of operation for 
conference-aware UAC and SIP Conferencing services.

Thanks Craig (irc:dexteruk)

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