CHAPTER 4.
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4-2
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4.1.2 Router ALG Interface
NAT Application Level Gateway (ALG)
When various functions such as the VoIP signal process function and gateway function
executed through the IP network in the OfficeServ 7200 are executed in the Network
Address Translation (NAT) network, the conversion between the private IP address and
public IP address should be performed. In this case, the call server and the data server
interface with each other and share the information on the conversion between the private
IP and public IP, which enables the OfficeServ 7200 to provide services smoothly. Each IP
address is translated automatically. This function operates only between the call server and
data server of the OfficeServ 7200.
Time Synchronization
In the OfficeServ 7200, the call server and the data server interconnect to each other and
synchronize their time. This function is only available between the OfficeServ 7200‟s call
server and data server.
SIP-ALG
When the OfficeServ 7200 functions operating through the IP network such as VoIP signal
processing, gateway etc. are operating on the Network Address Translation (NAT) network,
it may be necessary to convert between the Private IP address and the Public IP address.
For this purpose, an ALG is processed from the Data server‟s SIP-ALG in response to the
Call Server‟s SIP call.
