Mike's PBX Cookbook

Phantom Terminal Numbers

Phantom superloops allow you to define and configure Phantom Terminal Numbers - TNs with no associated physical hardware. Normally a TN with no physical hardware is disabled, though not if it's Phantom. Only analog (500) telephones are supported.

With Phantom TNs configured, we can define Phantom Directory Numbers (DNs). This in conjunction with the Default Call Forward All Calls (DCFW) feature, allows a call to a Phantom DN to be instantly redirected somewhere else - which can be very useful!

1. LD 97 - Configure a phantom Superloop

Print CEQU in LD 22, a phantom loop is shown with the prefix P (use N to create, X to remove).
If a Phantom Loop exists, note the loop number and continue with step 2, otherwise configure one:

Prompt Response Description
REQ CHG Change
TYPE SUPL Superloop Data
SUPL N0-N156
Local Superloop in multiples of four; for Option 11 systems, range is 64-80 in multiples of four; precede loop number with "N" to create a phantom loop; precede with an "X" to remove a terminal loop.

Each Phantom Superloop supports upto four 16 port analog line cards.

2. LD 10 - Define a TN for the phantom loop

Prompt Response Description
REQ NEW, CHG Add or change
TYPE 500 Only analog (500/2500) type telephones support Phantom TNs
TN l s c u
c u
Terminal number; if the loop is a phantom loop, "PHANTOM" is echoed.
For Option 11
DN xxx...x Directory Number; must be a single appearance DN
CLS CFXA Call forward external allowed, if required.
FTR DCFW 12 xxx...xx Default CFW length (12) and DN xxx...x (with Access Code if external)

3. Feature Operation

Operation of this feature with Call Forwarding is described below

In other words, dialing the Phantom DN, the call will always ring the DCFW DN, and this can be an external number!

Opt 11C Phantom Loops and associated TNs

With Rls 23.55, the loop number range is 64-80 in multiples of 4 - corrisponding to slots 41-60. With Rls 24+, the range is increased to 96-112 in multiples of 4 - corrisponding to slots 61-80. Refer to the following table to find the correct loop and slot number:

Rls 23.55
Phantom Associated TN (Card)
64 41 42 43 44 0-15
68 45 46 47 48 0-15
72 49 50 51 52 0-15
76 53 54 55 56 0-15
80 57 58 59 60 0-15
Rls 24+
Phantom Associated TN (Card)
96 61 62 63 64 0-15
100 65 66 67 68 0-15
104 69 70 71 72 0-15
108 73 74 75 76 0-15
112 77 78 79 80 0-15

Multiple users on a phoneset, each with DID and Voicemail

Another application for phantom DNs is to allow multiple users, with their own DNs, to share one phyical set. When a phantom DN rings, it is forced to forward (DCFW) to the physical phoneset - users with displays can see the forwarded number and tell who should pick up. If nobody answers, with Secondary Forwarding (CLS SFA), the call is forwarded again to the voicemail DN programmed in the phantom DN (FTR FDN xxxx).

Mailboxes are set up exactly as if the phantom phones were physical, with the phantom's extension as the mailbox extension number. The users will get no indication voicemail is waiting from a phantom phone, so they'll have to manually check it on their own.

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