Configuring SIP, SPCP, and NAT
Network Address Translation (NAT) and Cisco IP Phones
Cisco SPA 500 Series and WIP310 IP Phone Administration Guide 107
4
STEP 8 To collect information about what type of NAT your router uses click the SIP tab
and scroll to NAT Support Parameters.
STEP 9 Back in the
SIP
tab, select yes in the
STUN Test Enable
drop-down box.
View the debug messages to determine if your network uses symmetric NAT. Look
for the Warning header in REGISTER messages, for example, Warning: 399 Spa
“Full Cone NAT detected.”
STEP 10 Click Submit All Changes.
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