UCM6xxx series guidance two sorts of SIP trunks: “sign up SIP trunks”, generally used to connect with service provider’s trunk and “Peer trunks”, which can be accustomed to interconnect many IP-PBXs. UCM6xxx https://phoebeqnwp615626.tinyblogging.com/the-best-side-of-fxo-gateway-configuration-74641018