NAT supports multiple Application Level Gateways (ALGs) in the registration mode, including: - NAT ALG of the FTP protocol
- NAT ALG of the HTTP protocol
- NAT ALG of the RTSP protocol
- NAT ALG of the SMTP protocol
- NAT ALG of the PPTP protocol
- NAT ALG of the NBT protocol
- NAT ALG of the H.323 protocol (including T.120, RAS, Q.931 and H.245)
- NAT ALG of the SIP protocol
- NAT ALG of the GTP protocol
- NAT ALG of the HWCC protocol
- NAT ALG of the ICQ protocol
- NAT ALG of Tencent QQ chatting
- NAT ALG of MSN massager provided by Microsoft
- NAT ALG of the STUN protocol
- NAT ALG of the MGCP protocol
- NAT ALG of the MMS protocol
- NAT ALG of user-defined
HTTP is short for Hybertext Transfer Protocol. RTSP is short for Real-Time Streaming Protocol. SMTP is short for Simple Mail Transfer Protocol. ICMP is short for Internet Control Message Protocol. PPTP is short for Point to Point Tunneling Protocol. NBT is short for NetBIOS over TCP. SIP is short for Session Initiation Protocol. GTP is short for GPRS Tunneling Protocol. HWCC is short for Huawei Conference Control Protocol. STUN is short for Simple Traversal of UDP Through NAT. MGCP is short for Media Gateway Control Protocol. MMS is short for Multimedia Messaging Service. Supporting the special protocols in the "registration" mode, NAT can be expanded flexibly so as to support new protocols easily without changing the software architecture. | 
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