A system and method are disclosed herein for providing a unidirectional outage bypass for incoming communications via a hosted Voice-over Internet Protocol (VoIP) private branch exchange (PBX) system to a session initiation protocol (SIP) device. An outage monitoring system is in communication with both the unidirectional bypass system and one or more bypass enablers that act at the direction of the unidirectional bypass system. The outage monitoring system detects outages and overloads, as well as, network failures between network components, the VoIP PBX, Client Devices and the public switched telephone network (PSTN). The unidirectional bypass system, in response to detection of an outage, determines error-handling procedures for the unidirectional bypass based on bypass configuration data. The bypass enablers forward incoming communications between the PSTN and a bypass destination following a bypass route in accordance the error-handling procedures, by bypassing components that are currently experiencing failures or overloads.