A. Download and Configuration Utility
55
successful, the ZIP 2 then rewrites all outgoing SIP messages (including RTP port number and
source IP address) to masquerade as originating from that Public IP address and port. This is
required for SIP and RTP to traverse NATs, since without STUN, SIP would send explicit
references to the phone's private IP address and port which is not accessible from outside the
NAT/Firewall.
STUN requires a STUN server external to the NAT. This would typically be maintained by the
local ISP or ITSP. STUN works across most Firewalls and NATs with the exception of a "full cone"
NAT, defined as a NAT that rewrites both the IP address and port number of the phone each time
it makes a connection to the outside world.
To implement STUN, specify the IP address or FQDN of the STUN server and the STUN port on
the ToS/DiffServ/STUN panel, as shown in figure A-8.
A.2.9
VLAN
The VoIP VLAN Configuration panel sets the VLAN tag values for the call signalling and RTP
packets. Tag parameters that are not set in the panel will use the tags configured in the LAN
VLAN Configuration panel, as described in section A.2.4 on page 50.
To access this panel, select SIP from the main menu, then select VLAN in the sub-menu.
Important
Press the
Save VoIP VLAN Settings
button to save the configured values to the
phone. Settings do not take effect until you power cycle the phone or execute a
Reset command (see section A.2.16 on page 59).
A.2.10
CODECS
The Audio/CODEC Configuration panel sets jitter buffer and CODEC parameters. To access this
panel, select CODECS from the main menu.
Figure A-8
ToS/DiffServ panel
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