5.2.3 Peer-to-Peer (P2P) ConnectionDescriptionThis PBX automatically establishes peer-to-peer communication between peer-to-peer compatible IPextensions (i.e., IP-PTs and SIP extensions) that belong to the same P2P group. With peer-to-peer calls, thecall is routed directly from one IP extension to another without going through a DSP card, which means thatP2P calls are established without using the PBX’s resources.P2P ScenariosP2P calls can be established between telephones in a single site or across sites. The following illustrationsshow P2P calls established in a variety of network configurations. It is assumed that all the devices areconnected over a private IP network.P2P connection within a siteSite 2P2PRouter RouterPBXSite 1P2PPBXCalls between IP telephones within a site establish a P2P connection.P2P connection between branch offices over a VPN (hub-and-spoke connection)*1Remote Office 1Remote Office 2RouterSite 1PBXRouterHub routerP2PCalls between IP telephones in separate branch offices establish a P2P connection, using the hub router atSite 1 to communicate over a VPN.*1 When the VPN uses a hub-and-spoke (star) topology, the hub router must be configured to allow U-turn connections.Feature Guide 4515.2.3 Peer-to-Peer (P2P) Connection
