nat alg sip media-miss drop

Function

The nat alg sip media-miss drop command enables a device to discard NAT ALG SIP media streams before creating a server-map table.

The undo nat alg sip media-miss drop command disables a device from discarding NAT ALG SIP media streams before creating a server-map table.

This function is disabled by default.

This command is supported only on the NetEngine 8000 F1A.

Format

nat alg sip media-miss drop

undo nat alg sip media-miss drop

Parameters

None

Views

System view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
nat	write

Usage Guidelines

When NAT ALG for SIP is configured and SIP terminals on the private and public networks establish a connection, a private network user sends a SIP ACK packet to notify the CGN ALG of successful negotiation. Upon receipt of the packet, the CGN ALG generates a server-map table and uses it to create a correct flow table to guide media flow forwarding. If the CGN ALG receives media flows sent by the private network before creating a server-map, the CGN ALG creates a common flow table, which adversely affects media flow communication. To address this problem, run the nat alg sip media-miss drop command to enable the CGN ALG to discard NAT ALG SIP media streams before creating a server-map table. After the ALG server-map table is created, flow tables can be correctly created to ensure proper media stream communication.

Example

# Enable the CGN ALG to discard NAT ALG SIP media streams before creating a server-map table.

<HUAWEI> system-view
[~HUAWEI] nat alg sip media-miss drop