Patent ID: 8391899
Filing Date: 2013-03-05
Classification: H04L,H04W

Abstract:
1. A system comprising: a Home Subscriber Server (HSS) of an IP Multimedia Subsystem (IMS) network that connects to a first wireless network that serves a mobile device, and connects to a message center in a second wireless network that attempts to deliver a text message to the mobile device over the first wireless network but the delivery attempt fails due to the mobile device being temporarily unavailable; the HSS is operable to receive a first request from the message center in the second wireless network to be notified if the mobile device becomes available in the first wireless network, and to transmit a second request to a Home Location Register (HLR) in the first wireless network to be notified if the mobile device becomes available in the first wireless network; the HSS is further operable to receive a first notification from the HLR in the first wireless network that the mobile device has become available, and to transmit a second notification to the message center in the second wireless network that the mobile device has become available to allow the message center to retry delivery of the text message to the mobile device.