SIP ALG is a security component,it is created in the same way as a proxy policy and offers similar configuration options ,SIP ALG commonly found in a router or firewall device Such as Zyxel,If you are using a Zyxel router and experiencing dropped calls, we recommend disabling the SIP ALG feature of the router.It could be disable by the following CLI command: >ip nat service sip active 0 <--use value 0 to diable 1 to enable. >
1- Open a Command Prompt window cmd.
Navigate: Start > All Programs > Accessories > Command Prompt.
2- type "telnet 192.168.1.1" or substitute the numbers for the numbers of YOUR Zyxel gateway. It could be "telnet 192.168.0.1" or "telnet 192.168.2.1" then press the Enter key.
3-Enter the router password then press the Enter key.
Zyxel default password is 1234.
4-in the Menu option Type 24 then press the Enter key.
5-Type 8 then press the Enter key.
6-At the prompt type > ip nat service sip active 0 then press the Enter key.
1 comments:
ip nat service sip active show
to see if it's enabled or not.
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