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While the user is in an active call with one or more idle call appearances, the SK(xfer) will be
available. Press SK(xfer) places the current call on hold, and starts a new dial tone on one of
available line keys. Dial the transfer target number. When the target starts ringing or answers,
pressing SK(xfer) again to complete the transfer.
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While the user is in on a connected or proceeding call with one or more call appearances on hold, the
SK(xferLx) will be available. Pressing SK(xferLx) followed by the line key of the holding call that you
want to transfer to. If there is only 1 other call on hold, pressing SK(xferLx) immediately completes the
call transfer without the need to press another Line Key again.
Notes:
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At the completion of call transfer operation, the holding call peer will be the transferee, and the
connected or proceeding call peer will be the transfer target
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We refer to the case where a call transfer is completed when the transfer target is still ringing as
semi-attended call transfer. This should not be confused with a blind transfer which is described in the
next subsection.
Blind Call Transfer
We define a blind transfer as a call transfer operation where the transferor does not actually call the
transfer target. The transferor simply sends the transfer target information to the transferee in a signaling
message and then drops out of the loop. With this information, the transferee then calls the transfer
target.
To perform a blind transfer, press SK(xfer) or an unused Line Key during an connected call (where the
current call peer is the transferee) to start a new dial tone (i.e. you must have a spare call appearance).
Then enter *98; the phone will prompt the user to enter the transfer target number. Enter the number to
complete the blind transfer. The last call peer placed on hold by the SPA-841 will be the transferee.
Call Back
This service mimics the call back service offered by the PSTN. The user can activate this service on a
busy number such that he will be called back as soon as the busy number becomes available. The SPA-
841 (and other members in the SPA family) implements this feature by repeatedly dialing the busy
number periodically until the called party rings or answers, or until the service order is canceled by the
user or expires. For that reason, it is better referred to as the repeat dialing service.
To activate this service, the user selects a Line key and enters *66 (Call back activation code). The SPA-
841 then uses this call appearance to call the last called number. The retry period and expiration time are
configurable. To cancel the service, the user picks up any line and enter *86. When call back service is
active, the corresponding Line key will blink in green. The user can still use this line to make or answer
calls; when that happens the call back service is temporarily paused until the call appearance is idle
again.
When the call back number rings or answers, the call appearance will ring also like a normal incoming call
(the ring to be used is the default ring for the corresponding extension for that Line key). If the call back
party answers the call before the local user does, the SPA-841 sends holding tone to the call back party.
If the local user picks up the call back Line key first, he will hear ring back tone like a regular outbound
call.
Message Waiting Indication (MWI)
The SPA-841 indicates message waiting in 2 ways: