The LG Vertical Summit is a hybrid IP PBX which offers a robust digital and VoIP solution.
We need to first setup our SIP Data/SIP CO Attributes (PGM133) on CO Range (your range) for correct communication with our trunks. In this example we have added provisioning for our Dynamic routing within our VoIP network.
Then we will select CO Line Data/VoIP Attributes (PGM142) and our CO range will be (5-8). Setting the CO VoIP Mode to SIP & RTP-Packet-Relay. 
We will then look at the SIP Data/SIP Common Attributes (PGM210) and make changes in these areas;
Now we can setup the SIP trunk user ID settings by entering user index 1 ( or your assigned index ). SIP Data/SIP User ID Attributes (PGM126)
Finally be sure you have placed all correct network settings in the System IP Plan.
System ID & Numbering Plan/System IP Plan (PGM102)
