Patent ID: 8719370

Claim:
A method for transmitting a large message mode CPM (Converged IP Messaging) message, comprising: creating a MSRP (Message Session Relay Protocol) link respectively between a CPM client at a sending end and a participating function entity at a source end, between the participating function entity at the source end and a CPM control function entity, and between the CPM control function entity and an inter-working function entity before the CPM client sends a large message mode CPM message to a non-CPM system receiver in a target group, wherein a creator of each MSRP link acquires MSRP information of an opposite end through a media negotiation process and implements the creation of the MSRP link according to the MSRP information; then, sending contents of the large message mode CPM message by the CPM client at the sending end to the inter-working function entity through each created MSRP link sequentially; and sending the received contents of the large message mode CPM message by the inter-working function entity to the non-CPM system receiver after the inter-working function entity performs protocol conversion on the received contents, wherein the large message mode CPM message has a size of more than 1300 bytes, and cannot be carried within a Session Initiation Protocol (SIP) message.