Mitel MiVOICE BUSINESS, Engineering Manualline

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Typical Configurations
21
SAMPLE 3300 ICP CONFIGURATIONS
The sections below describe sample configurations:
• “The 3300 ICP as a Trunk Gateway” on page 21
• “The 3300 ICP as a Trunk Tandem” on page 21
• “MiVoice Business, 3300 ICP and ACD” on page 22
• “The 3300 ICP as a Dedicated Voice Mail Server” on page 31
THE 3300 ICP AS A TRUNK GATEWAY
If the 3300 ICP is used as a trunk gateway, the unit will act purely as a TDM-to-IP gateway. It
will not have IP phones registered. If phones are registered, then the number of trunks that can
be handled will be reduced. Other controllers will have large numbers of phones connected to
them but no TDM trunks (group controller or user gateway).
The limiting factor on a trunk gateway will usually be the number of E2T channels available on
it. If a controller that is used as a trunk gateway also acts as a resilient backup for all or some
of the IP phones on a group controller the trunk capacity will not necessarily be affected. The
assumption is that when the phones fail over to this controller there will be much less IP trunk
traffic to the other controllers in the network.
The trunks are expected to be busy 75% to 100% of the time. Therefore the number of trunks
and the number of E2T channels are directly linked. The maximum number of trunk channels
is about 120 channels, or 4 E1 / 5 T1 links on the large controllers (to match the 128 E2T
channels), and 60 channels for the smaller units (64 E2T channels).
In the MXE Controller 192 Gateway, the maximum number of trunks would be 180 E1 trunks
(6 links) or 192 T1 trunks (8 links). If SRTP is enabled the maximum number of E2T channels
is reduces to 150 (5 E1 links or 6 T1 links).
Few other device channels, such as voice mail or embedded RADs, should be programmed.
There should be no other TDM connectivity. One exception is Music-on-Hold. There are other
application scenarios, such as resilient/networked ACD configurations, where RADs would be
set up on the trunk gateway (see “MiVoice Business, 3300 ICP and ACD” on page 22).
See “Trunking gateway working example” on page 191 for an example of the calculations
needed.
THE 3300 ICP AS A TRUNK TANDEM
When the 3300 ICP acts as a Trunk Tandem, it functions similar to that described for the gateway
unit. Typically, this configuration is applied where there is already an established (TDM) PBX
network where the ICP units are being used for toll-bypass, or as an alternative route to the PSTN.
Note: For purposes of this discussion, the term TDM trunks refers to digital (T1/E1)
trunks only, although LS trunks could be used to increase the trunk quantity to exactly
match the available E2T channels.