You can gain the hole-punched address of Proud.CNetClient by following the steps below.
First, complete 5. Making a P2P group
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Gain information on client through Proud.CNetClient.GetPeerInfo or Proud.CNetServer.GetClientInfo.
The gained information of Proud.CNetPeerInfo.m_UdpAddrFromServer is the hole-punched address.
The success rate of ProudNet hole-punching is really high but it doesn't mean it works at 100%. Please refer to Proud.CNetPeerInfo.m_UdpAddrFromServer guide.