The Alg Screen; Technical Reference - Huawei B2268H User Manual

LTE TDD B2268H
User Guide
Figure 9-5 Network Setting > NAT > Sessions
The following table describes the fields in this screen.
Table 8-4 Network Setting > NAT > Sessions
LABEL
MAX
NAT
Session
Apply
Cancel

8.5 The ALG Screen

Use the ALG screen to enable or disable SIP Application Layer Gateway (ALG) on the LTE
Device. Click Apply to save your change.
The SIP ALG allows SIP calls to pass through NAT by examining and translating IP addresses
embedded in the data stream. When the LTE Device registers with the SIP register server, the
SIP ALG translates the LTE Device's private IP address inside the SIP data stream to a public IP
address. You do not need to use STUN or an outbound proxy if you enable the SIP ALG.
For the LTE environment, the LTE interface may experience heavy overhead when sending SIP
re-registration requests due to SIP server NAT session timeout. This default NAT session
timeout value (3600 seconds) helps to decrease the chance of this happening.
Figure 8-5 Network Setting > NAT > ALG

8.6 Technical Reference

This section provides some technical background information about the topics covered in this
chapter.
Issue 01 (2014-01-15)
DESCRIPTION
Use this field to set a common limit to the number of concurrent NAT sessions
each client computer can have.
If only a few clients use peer to peer applications, you can raise this number to
improve their performance. With heavy peer to peer application use, lower this
number to ensure no single client uses too many of the available NAT sessions.
Click Apply to save your changes.
Click Cancel to restore your previously saved settings.
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