Patent ID: 7991894

Claim:
A method, comprising: using a first group of successive session initiation messages of a session initiation protocol to signal attachment data, wherein said attachment data comprises binary data, and wherein said first group of successive session initiation messages comprise an invitation for a terminal to participate in a session, wherein said session initiation protocol is defined to initiate, maintain and terminate sessions with one or more terminals in a packet switched network, and wherein said using comprises fragmenting said attachment data in attachment fragments; attaching said attachment fragments to said first group of successive session initiation messages; filling up a session initiation message of said first group of successive session initiation messages only partly with an attachment fragment, wherein a size of the attachment fragment is not a maximum possible size of the attachment fragment; reserving spare space for routing information being added during transmission of said session initiation message of said first group of successive session initiation messages in said packet switched network; and sending said first group of successive session initiation messages from a first terminal towards a second terminal in the packet switched network, wherein said attaching said attachment fragments to said first group of successive session initiation messages enables the first group to be sent from the first terminal to the second terminal prior to an alerting phase of said second terminal, wherein the alerting phase comprises a session initiation protocol ringing message from the second terminal.