Patent ID: 8688848
Filing Date: 2014-04-01
Classification: H04L

Abstract:
1. A method of establishing a media link for transmitting a CPM message to a group, comprising: the transmitter CPM client transmitting a first session invite message which is routed to a source participation function entity via the SIP/IP core network; the source participation function entity generating and transmitting a second session invite message which is routed to a controlling function entity via the SIP/IP core network, and for each member of the group, the controlling function entity generating and transmitting a third session invite message which is routed to a destination participation function entity via the SIP/IP core network; the destination participation function entity generating and transmitting a fourth session invite message which is routed to a receiver CPM client via the SIP/IP core network; the receiver CPM client generating and transmitting a fourth success response message which is routed to the destination participation function entity via the SIP/IP core network, and the destination participation function entity generating and transmitting a third success response message which is routed to the controlling function entity via the SIP/IP core network; after receiving the second session invite message, or the third success response message, the controlling function entity generating and transmitting a second success response message which is routed to the source participation function entity via the SIP/IP core network; and the source participation function entity generating and transmitting a first success response message which is routed to the transmitter CPM client via the SIP/IP core network; the transmitter CPM client receiving the first success response message, and generating and transmitting a first response acknowledgement message which is routed to the source participation function entity via the SIP/IP core network; and the transmitter CPM client establishing a first media transmission link between the transmitter CPM client and the source participation function entity; the source participation function entity generating and transmitting a second response acknowledgement message which is routed to the controlling function entity via the SIP/IP core network; and the source participation function entity establishing a second media transmission link between the source participation function entity and the controlling function entity; the controlling function entity generating and transmitting a third response acknowledgement message which is routed to the destination participation function entity via the SIP/IP core network; and the destination participation function entity establishing a third media transmission link between the destination participation function entity and the controlling function entity; and the destination participation function entity generating and transmitting a fourth response acknowledgement message which is routed to the receiver CPM client via the SIP/IP core network; and the receiver CPM client establishing a fourth media transmission link between the receiver CPM client and the destination participation function entity, wherein the CPM message is a large message mode CPM message which cannot be borne with a Session Initiation Protocol (SIP) message, wherein the method is used to establish an MSRP multiple hops transmission media link through which a transmitter CPM client transmits a large message mode CPM message to a CPM pre-defined group or a CPM ad-hoc group, and wherein a CPM client is an initiative party for establishment of each section of media link; wherein, the establishment processes of the first, second, third and fourth media transmission links comprise: