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D-4
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SCCP)
OL-3141-01
Appendix D SCCP Call Flows
Call Flow Scenarios for Successful Calls
Table D-1 Action Descriptions for First Call Flow
Step Action Description
Step 1
StationRegister—Cisco ATA to Cisco CallManager Cisco ATA sends a message to announce its existence to the
Cisco CallManager.
Step 2
StationReset—Cisco CallManager to Cisco ATA The Cisco CallManager commands the Cisco ATA to reset its
processes.
Step 3
StationIpPort—Cisco ATA to Cisco CallManager The Cisco ATA provides Cisco CallManager with the UDP
port for the RTP stream.
Step 4
StationRegisterAck—Cisco CallManager to Cisco
ATA
Cisco CallManager acknowledges the registration of the
Cisco ATA.
Step 5
StationCapabilitiesReq—Cisco CallManager to
Cisco ATA
Cisco CallManager requests the current capabilities of the
Cisco ATA.
Step 6
StationVersionReq—Cisco ATA to
Cisco CallManager
Cisco ATA requests the version number of the software.
Step 7
StationCapabilitiesRes—Cisco ATA to
Cisco CallManager
Cisco ATA responds to the Station Capabilities Request
message from the Cisco CallManager. These capabilities are
cached in the Cisco CallManager and are used to negotiate
terminal capabilities with an H.323-compliant terminal.
Step 8
StationVersionRes—Cisco CallManager to
Cisco ATA
Cisco CallManager informs the Cisco ATA of the current
software version number.
Step 9
StationButtonTemplateReq—Cisco ATA to
Cisco CallManager
Cisco ATA requests the button template definition for that
specific Cisco ATA.
Step 10
StationButtonTemplateRes—Cisco CallManager to
Cisco ATA
Cisco CallManager updates the button template information
contained in the Cisco CallManager.
Step 11
StationTimeDateReq—Cisco ATA to
Cisco CallManager
Cisco ATA requests the current date and time for internal
usage and for displaying a text string.
Step 12
StationDefineTimeDate—Cisco CallManager to
Cisco ATA
Cisco CallManager provides the date and time information to
the Cisco ATA.