I was given a UMC6108 for my small business (veterinarian hospital). We have ~ 20 phones that it will work with. Right now we have an old Tadiran PBX that is working that I want to replace. I have the UMC6108 powered up and have flashed to the latest and EOL firmware. I am looking for information about connecting to a SIP trunk provider. I have a provider who has given me some information to connect but I am not sure where this should go. Also I am concerned with security given the stories of hackers so want to make sure that I set it up safely. It is behind a ubiquiti network gateway. If you can point me to documentation or videos that would be helpful.