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Harald Welte laforge at gnumonks.orgSome more thoughts on that old topic: A custom protocol seems to make more and more sense. Neither original RSL nor 08.08 seem to be a close match. Some more specification of the original protocol idea: On Wed, Apr 14, 2010 at 11:48:22PM +0200, Harald Welte wrote: > * ESTABLISH REQUEST -- app requests a channel be established to MS (by IMSI) Parameters: * mobile identity (tmsi/imsi) (can re-use 04.08 mobile identity IE) * channel type (sdcch/tch) (can reuse RSL information element) * which parts of the protocol shall openbsc handle (RR/MM/CC) * unique reference identifying this 'call/radio channel' > * ESTABLISH CONFIRM -- network confirms a channel has been established (confirmation that the radio channel has been established) Parameters: * unique reference identifying this call/radio channel * exact arfcn/timeslot/sub-slot that was established (can be RSL or 04.08 channel description) > * ESTABLISH INDICATION -- network tells app connection was made by MS (confirmation that a LAPDm connection was established) Parameters: * unique reference identifying this call/radio channel * SAPI (RSL Link ID) > * [UNIT] DATA REQUEST -- app requests data to be sent to MS > * [UNIT] DATA INDICATION -- network indicates data was received from MS Parameters: * unique reference identifying this call/radio channel * SAPI (RSL Link ID) > * ERROR INDICATION -- network tells app something went wrong Parameters: * unique reference identifying this call/radio channel * error code / reason > * RELEASE REQUEST -- app asks network to release channel Parameters: * unique reference identifying this call/radio channel > * RELEASE CONFIRM -- net tells app that channel was released (as rqd) Parameters: * unique reference identifying this call/radio channel > * RELEASE INDICATION -- net tells app that channel was released (by MS) Parameters: * unique reference identifying this call/radio channel -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)