Cisco SPA2102-AN - Single Port Router Administration Manual page 49

Configuring Your System for ITSP Interoperability
Network Address Translation (NAT) and Voice over IP (VoIP)
STEP 3
STEP 4
STEP 5
STEP 6
Cisco Small Business ATA Administration Guide
Scroll down to the NAT Support Parameters section, and then enter the following
settings to support static mapping to your public IP address:
•
Handle VIA received, Insert VIA received, Substitute VIA Addr: yes
•
Handle VIA rport, Insert VIA rport, Send Resp To Src Port: yes
•
EXT IP: Enter the public IP address for your router.
Click Voice tab > Line
Scroll down to the NAT Settings section.
•
NAT Mapping Enable: Choose YES.
•
NAT Keep Alive Enable: Choose YES (optional).
Click Submit All Changes.
You also need to configure the firewall settings on your router to allow SIP
NOTE
traffic. See "Firewalls and SIP," on page
Voice tab > SIP: NAT Support Parameters
N
, where N represents the line interface number.
Voice tab > Line N > NAT Settings
53.
3
49