Configuring Your System for ITSP Interoperability
Network Address Translation (NAT) and Voice over IP (VoIP)
Cisco Small Business ATA Administration Guide 46
3
Voice tab > SIP > NAT Support Parameters
STEP 4 Click Voice tab > Line , where N is the number of the line interface.
STEP 5 Scroll down to the NAT Settings section.
NAT Mapping Enable: Choose yes.
NAT Keep Alive Enable: Choose yes (optional).
Voice tab > Line N > NAT Settings
NOTE Your ITSP may require the SPA device 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 Firewalls and SIP, on page 48.
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