Configuring SIP, SPCP, and NAT
Network Address Translation (NAT) and Cisco IP Phones
112
Cisco SPA and Wireless IP Phone Administration Guide
5
STEP 1
Log in to the web administration interface.
STEP 2
Click Admin Login and advanced.
STEP 3
Click the SIP tab.
STEP 4
Under NAT Support Parameters, configure the following:
•
Handle VIA received:
yes
•
Handle VIA rport:
yes
•
Insert VIA received:
yes
•
Insert VIA rport:
yes
•
Substitute VIA Addr:
yes
•
Send Resp To Src Port:
yes
•
STUN Enable
: Choose
yes
.
•
STUN Server:
Enter the IP address for your STUN server.
STEP 5
Click the Ext <number> tab. Configure the following:
•
NAT Mapping Enable:
Choose
yes
.
•
NAT Keep Alive Enable:
Choose
yes
(optional).
NOTE
Your ITSP may require the phone to send NAT keep alive messages to keep
the NAT ports open permanently. Check with your ITSP to determine the
requirements.
STEP 6
Click
Submit All Changes
.
NOTE
You also need to configure the firewall settings on your router to allow SIP
traffic. See
“Configuring SIP,” on page 89
.
