We have a yealink IP SIP phone that needs to connect from the outside. We have set up the phone and tested it internally and it's good so we moved it externally.
In the phone, we edited the account and put in the public IP of our router (a Sonicwall NSA4600) and waited for the phone to register. It fails to register.
I've checked the ports and I DO have the right ports open on the Sonicwall but I've also read a lot of posts about people having trouble with SW and SIP phones. So, after reading, I have made the changes suggested on the posts I've read and still no joy.
I'm using https://www.yougetsignal.com/
to test 5060 and it reports that it's closed.
Does anyone have any insight into how to make the SW work well with the SIP phone?
PS: An alternate port scanning tool tells me the port is filtered. So, I'm looking up how to turn filtering off in the sonicwall for this service.