Multiparty SS¶

The multi-party supplementary service builds on top of the Call Hold (HOLD) supplementary service
h2. Relevant Specifications

• "3GPP TS 22.084: Multi Party (MPTY) supplementary service; Stage 1"
• "3GPP TS 23.084: Multi Party (MPTY) supplementary service; Stage 2"
• "3GPP TS 24.010: Supplementary services specification"
• "3GPP TS 24.080: supplementary services specification; Formats
  and coding"
• 3GPP TS 24.084: Multi Party (MPTY) supplementary service; Stage 3

Notes¶

• the previously held party will get notification by means of a single SS Facility with two components:
  • Invoke/NotifySS/CallRetrieved
  • Invoke/NotifySS/MPTYindicator
• the previously active party will receive
  • Invoke/NotifySS/MPTYindicator

Putting MPTY call on hold¶

this is typically done to do another call?

• Facility/Invoke/HoldMPTY

Splitting MPTY call to have a private conversation with one participant¶

• Facility/Invoke/SplitMPTY

Call termination¶

• simply use normal call clearing using the TI of the specific call

Retrieving a MPTY call¶

• Facility/Invoke/RetrieveMPTY
  • no call retrieved notification is sent to remote parties