I'm wondering if anyone else has come across this issue before? We've got several sites connected to an IP Office over a VPN which work fine, all sites are using a mix of J139's and J179's - All of the phones show on system status as SIP Feature. The customer has a new site but when registering a phone over the VPN, it's showing as "standard SIP" and not "SIP feature", so no features are available on the phone. My thoughts are certain ports are potentially being blocked (8411?) locally. Unfortunately we don't look after their local network/firewall. I've tried running a monitor trace but I can't see any reasons as to why it's showing as a standard SIP device. The 46xxsettings are autogenerated and the phones are using TCP. Any suggestions are welcome, thank you.