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Property:Door-Intercom

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Term

Term: Door-Intercom Wiki Freetz IPPF whmf AVM Web
Short for: Door Intercommunication Device
Location: Lexicon >> Telephony-Terms
Weblinks: Wikipedia.int  -  Wikipedia.de
Description: Intercom for asking who was ringing and for opening the door

Goto:   FRITZ!OS   -   SMW-Browser

Details

An Door-Intercom is an Intercom for asking who was ringing at the door and for opening the door in remote.

Minimalistic

A minimalistic system consists of:

  • The outdoor station with a microphone, a speaker and a button to ring
  • The Electric-Strike mounted at the door for opening it
  • An indoor telephone alike device with a button to open the door
  • A Doorbell which may be a part of the indoor telephone
  • A power supply unit, typically with 2 separate outputs for communication and Doorbell + Electric-Strike

Communication typically works like a Telephone and requires 2 wires. 2 further wires (sometimes 3) are requred
for the Doorbell and the Electric-Strike.

PBX-Connected

Advanced systems act like a Telephone and could be connected to an existing PBX system. The ringing button triggers the
dialling of a phone number, the Doorbell is replaced by the ringing target Telephones. The Electric-Strike is activated by
a Relay which is triggered by dialling some DTMF tone on the target Telephone.

Insecure systems (most of them) place the Relay inside the outdoor station. A housebreaker can easily open it, defeat the
Relay, and open the door with the Electric-Strike. Secure systems keep all wires to the Electric-Strike indoor, but require a
separate device for the Relay.

There are adapter devices which could connect an existing Minimalistic Door-Intercom to an existing PBX system, like the
Auerswald TSA-a/b, which uses an existing power supply unit and has inputs for 2 ringing buttons. It contains 2 Relays, one is
used for the Electric-Strike, the other could either switch the existing Doorbell as a secondary bell, or drive an external Relay
to switch on light.

Today a large scale of standalone PBX connected Door-Intercoms exist, either connected analog, by DECT or ISDN, or using
VoIP over Ethernet or WLAN. IP based solutions are also availlable with integrated IP-Camera.
Many of these systems introduce new security risks, some systems even add privacy leaks by Dialling-Home to the Vendor.

FRITZ!OS

Door-Intercom

Recent FRITZ!OS can explicitely add a Door-Intercom as a Telephony device:

There you can choose between:

  • FON1 / FON2 - Door intercom system with a/b interface
  • LAN / Wi-Fi - IP outdoor intercom system

ISDN and DECT solutions are not explicitely configurable as a Door-Intercom (fw 7.29):

At least a Telegärtner DECT station is automatically detected as a Door-Intercom.

The disadvantage of not being configurable as a Door-Intercom are:

  • No list of Doorbells, target Telephone routing and Ringtones
  • No configurable character sequence for door opener
  • No dedicated URL for the Live-Image

See also these related AVM pages:

IP-Camera

If a Telephony device is configured as a Door-Intercom it can configure a Live Image URL in its properties:

To configure a generic IP-Camera for the FRITZ!Fon go to:

This could also be configured in the FRITZ!Fon menu, but it's a hassle to type an URL using the numerical keys.

See also these related AVM pages:

Internals

Live Images URLs are configured in the configd ui-module which is maintained by libconfigd.so: 

root@fritz2:/var/mod/root# ctlmgr_ctl u configd

configd:settings/  or  configd:status/
<snip>
 LiveImage0/
  UID=0
  Name=axis1
  URL=http://axis1/axis-cgi/jpg/image.cgi?resolution=320x240&compression=1
  Refresh=0
  Type=0
<snip>

The handling of Live images is performed by dect_manager: 

root@fritz:$ strings /usr/bin/dect_manager | grep _live_image_ | [sort]]

dmgt_avm_adjust_live_image_account
dmgt_avm_cb_live_image_refresh_timer
dmgt_avm_display_live_image_auto_orientation
dmgt_avm_get_live_image_edit
dmgt_avm_get_live_image_move
dmgt_avm_get_live_image_option
dmgt_avm_get_live_image_options_size
dmgt_avm_get_live_image_right_button_index
dmgt_avm_handle_center_left_for_live_image_show
dmgt_avm_handle_center_right_for_live_image_show
dmgt_avm_map_to_menu_live_image_option
dmgt_avm_set_cur_live_image_uids
dmgt_avm_start_live_image_refresh_timer
dmgt_avm_stop_live_image_refresh_timer
dmgt_avm_toggle_live_image_auto_orientation
dmgt_manage_get_live_image_config
dmgt_manage_get_live_image_url
dmgt_manage_write_live_image_config

The handling of Door-Intercom images is also performed by dect_manager: 

dmgt_avm_cleanup_doorline_image_conversion
dmgt_avm_convert_doorline_image
dmgt_avm_doorline_image_conversion_closed
dmgt_avm_doorline_image_conversion_read
dmgt_avm_exec_doorline_image_conversion
dmgt_avm_handle_doorline_image_resolved
dmgt_avm_next_doorline_image_conversion
dmgt_avm_remove_doorline_image_file
dmgt_avm_stop_doorline_image_dimm
dmgt_avm_wget_doorline_image
dmgt_manage_alloc_doorline_image_conversion
dmgt_manage_find_active_doorline_image_conversion
dmgt_manage_find_doorline_image_conversion
/usr/bin/dect_doorline_image_conversion.sh file://%s /var/tmp/dmgr_images/doorline/%s none %u %u

Conversion of the images is performed by dect_doorline_image_conversion.sh.

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