AT&T SB67060 T1 Installation Guide Page 29

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Installation 28
Synapse Installation Guide
Trunk Port (FXO) Door Phone Support
A Trunk Port (FXO) door phone can be connected to any one of the four Line (FXO) ports on a Synapse SB67010 PSTN Gateway
as shown in Figure 13. The FXO door phone can be configured to call either a single extension or a group of extensions (a Ring
Group). You can use the WebUI to configure an FXO door phone. For more information, see “Configuring a Trunk Port (FXO) Door
Phone” on page 129.
In Call Appearance mode, Synapse requires a dedicated door phone line to be Trunk Reserved to a spare Deskset in order for
other Desksets not to seize that line for outbound calls. If there are no extra Desksets available for Trunk Reservation, the door
phone should be connected to the last, or closest to last, line of the last Gateway to limit the chance of the door phone line
being seized.
In Line Appearance mode, the Deskset user must be aware not to use the assigned line key for regular outbound telephone calls.
Desksets automatically select a line when going off-hook, so the Deskset will seize an assigned door phone line if all other lines
are busy.
Figure 13. Trunk Port (FXO) Door Phone Connection
FXO Door Phone
Bypass Phone
PSTN Gateway #1
FXO Lines 1–4
PSTN Gateway #2
FXO Lines 5–8
PSTN Telephone Connections
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