I'm struggling trying to get ad-hoc conferencing working on our UC520 with more than 3 parties. I've been told there are enough DSP resources and that this is possible on this unit. I've attached the commands which should make this possible to this post. Here are the parts of modifying my config I think where the problem may lay:
UC520(config-voicecard)#sccp local loopback0
This change requires SCCP to be in shutdown state.
UC520(config)#sccp ccm 10.1.1.1 identifier 1 version 4.1
CCM ip addr 10.1.1.1 is already configured;
Unconfigure that CCM and then retry...
SCCP operational state is up already.
UC520(config)#sccp ccm group 1
UC520(config-sccp-ccm)# associate ccm 1 priority 1
The specified CCM is already associated to the selected CCM group.
After entering these command I am not even able to do a normal 3 party ad-hoc conference--the phone says "Could not complete Conference". Please see full attachment.
Your help is appreciated.