Calls to 800 numbers and specific area codes fail to complete.
All Ubee Modem-Routers
- Log in to the Ubee combo unit.
- Go to Advanced > Options and uncheck the box to the right of SIP.
When SIP ALG is enabled on Ubee devices, it modifies the SIP packet headers and causes the carriers to reject the packets. This leads to issues that mimic call termination, and calls do not complete as expected.