
System Software Diagnostics Guide — September 2006 133
PSTN Diagnostics Tool Reference
The commands under this button are as follows:
HoldCall
Place a call on hold. A call that is on hold is disconnected from the external receive and
transmit data streams that are associated with the Telephony Service Channel (TSC) instance.
Once the call is on hold, the client is free to establish a new call, either by making an outbound
call, or by receiving an inbound call.
RetrieveCall
Retrieve a call that is on hold, and bring it to the active state. The completion of the Retrieve
Call operation is indicated via a Call State event that reports the call state transition to
Connected. Note that if there is a call active when the RetrieveCall command is issued, then
that call will be placed on hold, so the command can be used to alternate between two calls.
ReconnectCall
An alternative to the RetrieveCall command, ReconnectCall will retrieve a call that is on hold
and make it the active call. The difference is that if a call is active when the command is issued,
that call will be dropped rather than put on hold.
Figure 14. Call Hold Command Buttons
Call Transfer Commands
Note: The following commands are advanced functions for technical support use only.
The commands under this button are as follows:
BlindTransfer (single-stage blind-transfer)
Place the target call on hold, make a consultation call to the destination address, and then hand
off the target call to the destination without determining the outcome of the consultation call.
The target call's call state will transition first to HoldPendXfer, and then to Idle.
InitTransfer (part of multi-stage transfer)
Place the target call on hold (HoldPendXfer) and initiate a consultation call to the destination
address.
CompleteTransfer (part of multi-stage transfer)
Transfer the call that was the target of the InitTransfer command to the destination address.
CancelTransfer (part of multi-stage transfer)
Cancel a supervised transfer by dropping the consultation call and reconnecting to the call that
was the target of the transfer operation.
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