How to enable and disable SIP ALG in linux based DrayTek Routers

To enable ALG:

kmodule_ctl nf_conntrack_sip enable

kmodule_ctl nf_nat_sip enable

To disable ALG:

kmodule_ctl nf_conntrack_sip disable

kmodule_ctl nf_nat_sip disable

ALG is disabled on the default setting.

Note:  SIP ALG setting is not saved to flash in the Vigor2130, so if you reboot the router, you will have to re-enter the commands again to re-enable SIP ALG

Update: SIP ALG can now be enabled/disabled using the GUI interface under NAT >> ALG