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Voice traffic only travels one-way with a Cisco VPN Client connection to the PIX/ASA

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Core issue

This issue is documented in Cisco bug IDs CSCsf03420 and CSCsd69887.

Voice traffic fails to pass bi-directionally when VPN Client software versions 4.6 through 4.8 connect to the VPN 3000 Concentrator/Adaptive Security Appliance (ASA)/PIX using Advanced Encryption Standard (AES) encryption.

Resolution

As a workaround, choose from either one of these two options: