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IP Communicator VPN Firewall

Please help. We are using Cisco IP Communicator with Cisco CallManager 3.3(5). On the local LAN (inside) it works very well - when u place a call u can hear the remote party and they can hear u. However , when u dial in from outside and access the CallManager via Cisco VPN client and PIX firewall there is one-way audio - U can hear the remote party but they can't hear you. Could it be ports we need to open on the firewall and if so which ones. Any help will do. Many Thanks

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