PRI Trunks can be connected in 2 ways , either by using a hardware that can fit into the system in a PCI express slot or by a PRI gateway like the other forms of trunk to the network. PRI Cards are available in 1 Port, 2 Ports, 4 Ports & 8 Ports and multiple such cards can be connected in Com1 Ip Pbx though for stability we recommend not more than one card in one system.
PRI Gateway converts PRI Trunk to SIP Trunk. PRI Gateway has provision to insert PRI Line while output is network cable that is connected to the same network that connects Com1 Ip Pbx. PRI Gateway comes with a configuration as low as 1 Port to as high as 14 Ports with most widely sold being 1 Port. We strongly recommend Dinstar though every standard PRI Gateway can be connected to Com1 Ip Pbx.