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CUPC growing delay over VPN

Hi, anyone come across this issue before. When using CUPC over a Cisco VPN (client) tunnel, the delay in speech gets longer and longer. If you switch to using IP Communicator it is fine. Both are using the same codecs. Is there any QoS I need to take into account here? For example, does CUPC mark the rtp stream as EF etc.

Glyn

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