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With an IP phone that uses the VPN 3002 Client, the user experiences one-way audio during a conversation
The VPN 3002 Hardware Client may be configured to work in Port Address Translation (PAT) mode.
VPN 3002 is capable of operating in two modes: Client mode and NEM (Network Extension Mode). In Client mode, all the hosts earlier than the 3002 are in PAT mode to the outside IP address of the 3002. However, PAT breaks H.323. H.323 does not work with PAT.
When the VPN 3002 works in NEM, the remote networks are capable of seeing each other using their real IP addresses, not a NAT or PAT IP address. If the VPN 3002 works in NEM, then H.323 works.
IP phones earlier than a 3002 work only in NEM.
To configure the VPN to work in NEM, perform these steps:
Select Configuration > Quick > PAT.
Choose No, use Network Extension mode from the PAT window to configure NEM.