Zultys ZIP2, User Manual

Page: 35 / 98

5. Provisioning the Phone
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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 5-5.
5.3.6 Configure other options
The Download and Configuration Utility provides many other panels for configuring ZIP2
phone parameters. A list of these parameters include:
VLAN Settings. see section A.2.4 on page 50 and section A.2.9 on page 55.
SIP Stack Extensions. see section A.2.6 on page 53.
Out of band signalling. see section A.2.7 on page 54.
ToS/DiffServ settings. see section A.2.8 on page 54.
CODECs and Jitter buffers. see section A.2.10 on page 55.
System Password. see section A.2.11 on page 56.
Local time settings. see section A.2.12 on page 58.
Ringer tone. see section A.2.13 on page 58.
SNMP settings. see section A.2.14 on page 59.
Figure 5-5 ToS / DiffServ / STUN panel