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Video door intercom systems connected to the Gigaset T300/T500 can be ma= de visible on the display of the Gigaset DE900/700. Here we describe the pr= otocol used to make this possible.
When a door intercom is pressed, it initiates a call to a user phone thr= ough the PBX. The PBX appends additional proprietary SIP headers "X-GC-Door= line" and "X-GC-Doorline-DTMF" in the SIP INVITE.
The header X-GC-Doorline contains an URL address to images made by IP ca= mera of door intercom
Example:
X-GC-Doorline: http://192.168.2.3:12345/some/path/u= rl.jpg
This header can only be used upon call setup, not in Re-INVITE or UPDATE= Transactions. The phone must identify itself with a suitable User Agent He= ader (Model Type, MAC Adress, Firmware version=E2=80=A6 ) when requesting t= he file.
PBX shall process the images coming from the door intercom to display pr= operly on the separate phones (resize, rescale).
The header X-GC-Doorline-DTMF contains the DTMF sequence for action =E2= =80=9Copen door=E2=80=9D.
Example:
X-GC-Doorline-DTMF: *89#
Remark: Various door intercoms can provide various action interfaces, e.= g. via DTMF, SIP INFO, etc=E2=80=A6
When the user phone receives such kind of INVITE, it recognizes that the= call is triggered by a door intercom. Then it can present user interface d= ifferent than in usual Voip call. The Phone shows the scene catched by the = camera of the doorline (URL is carried by "X-GC-Doorline") and provides the= =E2=80=9COpen door=E2=80=9D key. When the user presses the =E2=80=9COpen d= oor=E2=80=9D key, the phone sends the DTMF sequence (carried by "X-GC-Doorl= ine-DTMF") to the door intercom for opening the door.
The phone may play this sequence when the user presses the =E2=80=9COpen= Door=E2=80=9D key.