I’m having an issue with SIP 403 errors whenever I try to make a call to our office that is using VOIP. I have already disabled NATing on 5060/5061 ports which worked fine before, but we have changed an Asterisks provider to a Metaswitch provider and now we’re getting this error. I was told I may need to make a filter rule for traffic to their Session Border Controller.
Where would I put an outbound proxy in the new filter rule section of the Mikrotik? Any help would be much appreciated!