Polycom PVX Release Note page 24

Release Notes
Polycom PVX Version 8.0.2
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4. Confirm that the vvsys.exe and Windows NetMeeting check boxes
are selected.
• T.120 may not work properly through some NAT devices.
• If calls stop working after you configure the software and the NAT device,
ensure that the NAT is still configured properly. Internal testing has
shown that some NAT devices can lose their settings and must be
reconfigured. Verify that you have the latest firmware for your NAT
device.
• After installing a new NAT device and configuring the NAT device
settings in the Polycom PVX software, you must power cycle both the
device and the computer. To do this:
1. Close all applications currently running on the system.
2. Power off the computer.
3. Power off the NAT device.
4. After 30 seconds, power on the NAT device.
5. Power on the computer.
6. Restart Polycom PVX.
• If the system is registered with an Internet Locator Server or a Global
Directory and you delete the server address, the system displays a server
error message. Clear the Register check box instead.
• Auto-discovery of a gatekeeper may not operate properly if the PVX
system is connected to a router.
• PVX calls conducted over a network that uses a combination of both a
NETGEAR® router and a Cisco® Gatekeeper may disconnect after a
period of approximately four minutes.
• PVX systems registered to the Global Management System that are also
located behind a NAT must open port 3603 (TCP) on the NAT firewall
device.
Session Initiation Protocol (SIP) Issues
• T.120 is not supported in SIP calls.In a SIP call that uses a 128 kbps
continuous presence meeting room on the MGC™, the audio is received
before the video. In a SIP call from a system behind a UPnP router, the
receiving site sees the calling system's internal IP address instead of the
external address. In a SIP 768 kbps transcoding MGC call with auto audio
and H.263 video, the IP+48 card on the MGC crashes when the second
PVX starts to connect. If you place a SIP call using a SER server and hang
up before the call connects, your PVX system crashes. You can specify the
server name in the format <host>:<port>, where <host> can be either an
IP address or a DNS name.
• Encryption and People+Content do not work in SIP calls.
• On the Setup > SIP page, you must enter the IP address of the SIP proxy
server in the Proxy Server field. In PVX version 8.0.0, you were not
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