UCM6xxx sequence help two different types of SIP trunks: “sign-up SIP trunks”, generally utilised to connect with company’s trunk and “Peer trunks”, which can be used to interconnect many IP-PBXs. UCM6xxx https://emilyiofa262402.wikinstructions.com/967377/5_easy_facts_about_gxw410x_pstn_gateway_configuration_described