This looks like the issue: It appears new(ish) installations have sip profiles that are referring to variables on Advanced > Variables that no longer exist.
An oversight in changes to the code.
1. edit each
internal sip profiles
2. make sure the sip-port variable is set to 5060 and NOT a variable name
3. make sure the tls-sip-port variable is set to 5061 and NOT a variable name
4. save after edit
5. edit each
external sip profiles
6. make sure the sip-port variable is set to 5080 and NOT a variable name
7. make sure the tls-sip-port variable is set to 5081 and NOT a variable name
8. save
9. restart freeswitch
10. go to Status > SIP Status and verify all sip profiles are running