Chapter 4 Basic and Additional SIP Services
Additional SIP Services
•Two or more hosts are returned. The two hosts with the highest priorities are used as the primary and backup proxy servers (AltGk is ignored in this case).
Related Parameters
•GkOrProxy, page
•AltGk, page
Hardware Information Display
Cisco ATA hardware information is displayed in the
NAT Gateway
Network Address Translation (NAT) supports port mapping and forwarding to standard default SIP signaling port 5060 and media base port 16384, or other ports as configured in the Cisco ATA. Media ports are evenly numbered from the base port. NAT must support multiple port mappings. The
Cisco ATA can use up to four media ports to handle conference calls on both lines. For example, if media base port 16384 is used for one call, the next call uses port 16386 and other calls will use ports 16388 and 16390.
Note Routers such as
To configure the Cisco ATA to work in a NAT environment, modify the following parameters:
•StaticRoute, page
•NATIP, page
•SIPPort, page
•MediaPort, page
NAT/PAT Translation
To maintain Network Address Translation/Port Address Translation (NAT/PAT) for a session, the Cisco ATA can be configured to periodically send a dummy UDP packet to a server (the Cisco ATA does not expect any response from the server).
Related Parameters
•NatTimer, page
•NatServer, page
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
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