Specifications

Applications
121
3300 ICP Applications
The 3300 ICP supports a number of applications. This includes applications that are embedded
in the product, such as voice mail, through to providing DSP resource to allow connections to
external devices, for example a remote central voice mail in another unit. Other interfaces include
MiTAI for MiCollab Client Softphone operation. For more information on these applications, see:
• External Hot Desk Users
• “Voice Mail” on page 122
• “Networked Voice Mail” on page 122
• “Embedded Music On Hold” on page 123
Refer to the application’s documentation for setup information.
Additionally, the “Application Processor Card” on page 124 describes how the APC card hosts
the 6000 Managed Application Server (MAS) to run additional applications.
External Hot Desk Users
The concept of external hot desk users (EHDU) was added in MCD 4.0 and when used in
conjunction with personal ring groups (PRG) is also known as “Dynamic Extension". This is
similar in function to the external “Mobile Extension” application, but is now an embedded
application. Although it actually uses fewer system resources than Mobile Extension, EHDU
must still be carefully considered when determining the total call traffic in a system and the
number of trunks required.
• Each call to a DN in a personal ring group counts as a call in the total system traffic. If a
call comes in from an external trunk to a PRG with three members, then that call becomes
three calls for purposes of calculating traffic performance (cph).
• Only the one call that is answered counts as a completed call for purposes of traffic intensity
(CCS or Erlangs), although all of the attempted calls do use a channel for a few seconds
while in the ringing state.
• The voice channels used during ringing state are important when counting the number of
trunks that might be necessary to support this type of call traffic. Each EHDU device that
is called as part of a PRG requires one B-channel on a digital trunk while it is ringing, but
when one line is answered all of the other voice channels are dropped. If a user has a desk
phone and two external numbers in his PRG, then a call to him from the PSTN will use three
B-channels while ringing (one incoming and two outgoing) and two if answered on one of
the external phones (one incoming and one outgoing). A call from an internal user to that
same person will use only two trunks while ringing, one if answered on one of the outside
lines, and none if answered on the internal line.
External Hot Desk Users may also be programmed in two other ways in a system. An external
phone can be programmed as an EHDU even if there is no internal desk phone associated
with it, and under these conditions it will always use one trunk when either ringing or answered.
If there is only a single EHDU associated with an internal set then the pair can use External
Twinning, which operates in the same was as any other EHDU but does not required an IP
license for the second (external) set.