D.6 LI for file transfer

33.1273GPPLawful Interception (LI) architecture and functionsRelease 18TS

D.6.1 Background

When an RCS user desires to send a file to one or more other RCS users, the file URL transfer service is used. The user first uploads the file to a HTTP Content Server, and then uses pager mode standalone messaging, large message mode standalone messaging, 1-to-1 Chat or group chat procedures described in sections D.4 and D.5 respectively to send the URL of the file to the recipient(s).

When using pager mode standalone messaging, the originating client sends the URL of the file in a SIP MESSAGE as a CPIM-formatted message. When using large message mode standalone messaging, 1-to-1 chat or group chat the originating client sends the URIL of the file in MSRP data chunk.

The originating client may request delivery and/or display notification to the recipient(s).

If the recipients send status notification(s), they are sent as CPIM-formatted messages and may be delivered by the recipient in a SIP MESSAGE when using pager mode standalone messaging and in an MSRP data chunk when using large message mode standalone messaging, 1-to-1 chat or group chat.

D.6.2 Architecture

The figure 7.13.2-1 provides the architecture for LI for file transfer.

Annex E (informative):
STIR/SHAKEN operation