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generaitFlag for United States of America

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Remote softphone cannot register to LAN PBX via VPN

Hi all,
Appreciate in advance if anyone can help me this problem.
My office has one Juniper SSG5 firewall.
For remote users, I install Shrew soft VPN client for their remote access.
Users have no problem use VPN access LAN share drive or RDP to office desktop.
However users' softphone cannot register to LAN PBX through VPN.
I use wireshark and get attached result.
10.0.30.209 is VPN client.
10.0.1.180 is IP PBX.
From the capture, it shows Destination port: vat
I don't know what does that mean. Can somebody please give me a hint or direction for troubleshooting?

Thanks,
Vince
Capture.JPG
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Eikroman
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Thanks for your reponse.
Finally the PBX vendor modified system parameters then solved the issue.
The networking has no problem in this situation.
Again thanks for all inputs.