Cisco SPA942 - - IP Phone Administration Manual page 114

5
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
STEP 6
112
Log in to the web administration interface.
Click Admin Login and advanced.
Click the SIP tab.
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.
Click the Ext <number> tab. Configure the following:
• NAT Mapping Enable: Choose yes.
• NAT Keep Alive Enable: Choose yes (optional).
Your ITSP may require the phone to send NAT keep alive messages to keep
NOTE
the NAT ports open permanently. Check with your ITSP to determine the
requirements.
Click Submit All Changes.
You also need to configure the firewall settings on your router to allow SIP
NOTE
traffic. See "Configuring SIP," on page
Configuring SIP, SPCP, and NAT
Network Address Translation (NAT) and Cisco IP Phones
89.
Cisco SPA and Wireless IP Phone Administration Guide