Patent ID: 9014742
Filing Date: 2015-04-21
Classification: H04L,H04W

Abstract:
1. A method for establishing an ad-hoc push-to-talk (PTT) call between users in a wireless communications network, the method comprising: by a push-to-talk (PTT) server: receiving, via a session initiation protocol (SIP) server, a first SIP INVITE request from a mobile communication device, the first SIP INVITE request comprising one or more addresses of one or more parties invited to participate in the PTT call, wherein the one or more addresses comprise a first address of a first party; sending a second SIP INVITE request to the SIP server in response to the receiving the first SIP INVITE request, wherein the second SIP INVITE request is addressed to the first party, wherein the second SIP INVITE request is forwarded to the first party; receiving, via the SIP server, a first SIP 200 OK response from the first party, wherein the SIP 200 OK response is responsive to the second SIP INVITE request; sending a second SIP 200 OK response to the SIP server in response to the receiving the first SIP 200 OK response, wherein the second SIP 200 OK response indicates that at least one of the one or more parties invited to participate in the PTT call has accepted the invitation, wherein the second SIP 200 OK response is forwarded to the mobile communication device.