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“2nd Party Left Call” Indication For Private Call In DMO Disclosure Number: IPCOM000010957D
Original Publication Date: 2003-Feb-05
Included in the Prior Art Database: 2003-Feb-05

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Eitan Bar Dan Dory Gabi Ofir


While conducting a DMO call, the Master has no indication regarding whether other MSs are currently listening to him or not. Further more, if a Slave participating in a call wishes to leave it, then it does so without signalling on the air-interface. This procedure, when used for a private call causes a problem since the Master in this case continues to talk, having no indication that the second party is no longer listening. (For this reason, the standard recommends not to use this procedure during an individual call other than for emergency reasons (ETS 300 396-3: "Tetra technical requirements for DMO; part 3: MS-MS AI protocol - section item d).