| 主权项 |
1. A method for establishing a conference call between a VoIP device, a first peer device, and a second peer device, the method comprising:
sending a first session request through a fixed packet network to a communications server, wherein the first session request is used to establish a first communication session between the VoIP device and the first peer device, the first communication session comprising a link between the VoIP device and the communications server and further comprising a link between the communications server and the first peer device; sending a request to place the first communication session between the VoIP device and the first peer device in an on hold condition, wherein the on hold condition is maintained by placing the VoIP device in a receive-only state and by configuring the VoIP to discard any media received from the first peer device; and while the first communication session between the VoIP device and the first peer device is maintained in the on hold condition:
receiving at the VoIP device an indication message from the communications server, wherein the indication message comprises an invitation for the VoIP device to begin transmitting information that is needed by the communications server to initiate a second communication session between the VoIP device and the second peer device;sending a second session request, wherein the second session request comprises one or more signals carrying information that is used, by the communication server, to initiate the second communication session between the VoIP device and the second peer device, the second communication session comprising the link between the VoIP device and the communications server and further comprising a link between the VoIP device and the second peer device; andsending a switch request to the communications server, wherein the switch request initiates a switch between the first communication session and the second communication session at the VoIP device. |
