Specifications

Dispatch Call Procedure
Dispatch Call Processing
4-6 68P81095E55-E August 08, 2000
Fleet Member Identifier
Each end-user (MS) capable of dispatch calling has a unique Fleet Member ID. This
ID is specific to the fleet and may be re-used in different fleets. Dispatch services,
limitations and provisioning, are specified by Fleet ID, Group ID and Fleet Member
ID. The Fleet member ID is logically the same as the suffix used for in land line
communications.
The Fleet Member Identifier is used to indicate the caller and called MSs private
dispatch calls and to indicate the transmitter in the PTT-ID service in group dispatch
calls. The numbering within a fleet need not be contiguous, so removing a MS will
not require the others to be renumbered.
Dispatch Call Procedure
The simplified steps of a typical dispatch call are:
1) A dispatch call is requested via PTT activation.
The call request packet is routed to the DAP.
The DAP recognizes the MSs group and finds the group members by location
area (DLA).
2) The DAP sends location requests to the member's DLA to obtain current sector
or cell.
3) The group member MSs respond with each’s current sector or cell location.
4) The DAP supplies each member’s routing information to the MPS and PD.
5) Call voice packets are sent to the PD, where they are replicated and distributed to
the MSs sites.
Figure 4-4 Typical Dispatch Call Summary
PTT REQUEST
LOCATION REQUESTS
LOCATION RESPONSES
ROUTING INFORMATION
VOICE PACKETS
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