The SIP ALG setting is usually in your router. Login to your router's webpage configuration and look for the setting for SIP ALG. Check the Firewall area or WAN setup.
After you disable SIP ALG in your router, make sure you click "apply settings".
Reboot your router and the OBi (by powering each off and on) to make sure the setting is active.
SIP ALG Issues
AddressObihai Technology, Inc.
51 E. Campbell Avenue
Campbell, CA 95008