If you don’t know how to enable or disable SIP ALG feature in your Home 4 G Router that you can follow the video below and which will explain that how you can enable or disable your Huawei 4G router.
You might have problem connecting your sip extension at home or not abe to connect your office sip extension. Then you should disable this feature to connect your soft phone with SIP server.
SIP ALG stands for Application Layer Gateway, and is common in many commercial routers. It intends to prevent some of the problems caused by router firewalls by inspecting VoIP traffic (packets) and if necessary modifying it. Many routers have SIP ALG turned on by default.
How to Enable or Disable SIP ALG in Huawei 4G Router