NAT firewall traversalThe IP Phone E supports two methods for NAT traversal of the signaling path:•

105
Three-port switch and VLAN
functionality
System overview
The Full VLAN support feature can create telephone Voice-VLAN and PC
Data-VLAN on the three-port switch of the IP Phone E manually and automatically (see
Figure 12 "Voice-VLAN and Data VLAN" (page If both Data and Voice VLAN’s are enabled on a three-port switch, only the frames with Data and Voice VLAN tagged go to networks. The IP Phone
1140E receives only the frames with Voice VLAN tagged and sends the frames with Voice VLAN tagged, while PC or Local Networks receive all kinds of frames.
When only voice VLAN is enabled on three-port switch, all kinds of frames go to the Network, the IP Phone E receives only the frames with Voice
VLAN tagged and send all frames with Voice VLAN tagged. PC or Local
Networks receive all kinds of frames.
SIP Firmware Release 1.1 for IP Phone E Administration
NN43113-300 Standard May Copyright © 2008, Nortel Networks

106
Three-port switch and VLAN functionality
Figure 12
Voice-VLAN and Data VLAN
Table 43
Port functions on the three-port switch when VLAN is enabled
Ports
Voice VLAN enabled
Data VLAN enabled
Both Voice and Data VLAN
enabled
Network Port
(Port 0)
N/A
N/A
N/A
IP Phone
1140E Port
(SMP)
Receiving the frames with Voice VLAN
tagged only.
Sending the frames with Voice VLAN
tagged.
N/A
Receiving the frames with
Voice VLAN tagged only.
Sending the frames with Voice
VLAN tagged.
PC Port
(Port 1)
N/A
Tagging the incoming frame untagged and forwarding it to network port.
Tagging the incoming frame untagged and forwarding it to network port.
SIP Firmware Release 1.1 for IP Phone E Administration
NN43113-300 Standard May Copyright © 2008, Nortel Networks

System overview
107
Replacing the incoming frame tagged with VLAN
other than Data-VLAN
and forwarding it to network port.
Sending all kinds of frames.
Replacing the incoming frame tagged with VLAN other than
Data-VLAN and forwarding it to network port.
Sending all kinds of frames.
VLAN configuration can be done either manually or through DHCP. Refer to "Device Settings on the IP Phone E with SIP Firmware" (page for more detail on configuring VLANs.
SIP Firmware Release 1.1 for IP Phone E Administration
NN43113-300 Standard May Copyright © 2008, Nortel Networks

108
Three-port switch and VLAN functionality
SIP Firmware Release 1.1 for IP Phone E Administration
NN43113-300 Standard May Copyright © 2008, Nortel Networks

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