User manual

Advanced Configuration /
Advanced
116
BEC 6200WZL User Manual
SIP_ALG
Select Enable to activate SIP ALG feature or Disabled to disable this feature.
The Session Initiation Protocol (SIP) is an IETF-defined signaling protocol, widely used for controlling
multimedia communication sessions such voice and video calls over Internet protocol (IP). The
protocol can be used for creating, modifying and terminating two-party (unicast) or multiparty
(multicast) sessions consisting of one or several media streams. It is a text-based Application Layer
protocol.
But as many use NAT to communicate with the public networks, and the IP address and port
combination in SIP packets are needed for addressing, we must come up with an effective way to deal
with SIP NAT traversal. SIP ALG is an easy solution with which you are only required to enable SIP
ALG on NAT application in this router to easily experience the smooth SIP connection between private
networks and public networks or even in two private networks with your VoIP devices.
Port NAT
Port NAT is designed to separate LAN ports and Wireless interface to become, virtually, independent
working groups that all share with the same WAN IP but different WAN interface.
For example,
A user has two 3G/4G APNs, and he can put Ethernet port1, port2 and wireless1(three ports mainly
connected to devices for simple internet surfing) into a group, sharing interface MOBLE-APN1 to
communicate with internet devices.
Separate Ethernet port3 and port4 (ports used to connect to audio and video devices or mainly access
audio and video traffic) into another group sharing MOBLE_APN2.
Devices of each group work in an independent network without too much traffic loaded on one WAN
interface, making each group relatively enjoy a pure internet environment.