Nortel Networks CallPilot Desktop Messaging - Manual (Page 46)

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The original CallPilot message is marked as read when the forwarded message
is opened by the recipient. The feature makes use of the read receipt capability
of the e-mail server to whom the message was forwarded. When the read receipt
is received by CallPilot, the original message is marked as read.
Note: When the message is opened by the recipient an internal message
identification is added to the subject, and permits Message Waiting Indicator
(MWI) light to extinguish, when the message is read.
This feature is not supported by CallPilot systems and the option is disabled if a
CallPilot address is selected. Also, not all e-mail servers support Read Receipts.
Yahoo Mail does not, and Exchange 5.5 requires Service Pack 2 to fully support
Read Receipts. You determine if the e-mail system supports Read Receipts. See
the following Microsoft Knowledge Base article (KB217160) for an explanation of
the issue with Exchange 5.5: http://support.microsoft.com/
default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/q217/1/
60.asp&NoWebContent=1
By default, voice messages are sent in VBK format. You can choose to convert voice
messages to WAV. Note that there is currently no CallPilot Player available for
Macintosh OS X, Linux, or PDAs. These clients only support WAV playback.
There are advantages to sending messages in VBK format. While the CallPilot Audio
Player does need to be installed on the client, you are able to play CallPilot messages
over both the telephone and computer speakers, speed up or slow down playback
speed, and have a link to My CallPilot. Additionally, the VBK file is three to five times
smaller than the same message transcoded to WAV, so the download time and
network bandwidth requirements are lower.