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Cisco ASA blocking outbound VPN phone

I have an Avaya VPN phone which cannot connect. It is at remote Site B and is behind a Cisco ASA firewall. I am trying to get it to connect to the phone system at Site A. It works just fine if I bring the VPN phone to my home, but it does not work at Site B when behind the ASA firewall.

At first I could not get it to VPN at all but now that I have configured my access-lists on my ASA to allow IKE port 500, it can at least VPN. However, after it successfully VPNs, it gets stuck at "Discover [phone-server-ip]" The IP address listed on the LCD is the correct IP for the phone server, but it never gets past that. Is the ASA blocking it in some other way? I've read I may need to configure inspection or no fixup commands but need some guidance on that. Can anyone help?

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Hall of Fame Super Gold

Cisco ASA blocking outbound VPN phone

Wrong forum, post in "security - firewalling". You can move your posting using the Actions panel on the right.

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