Mitel 6800i Series Administrator's Manual page 341

A phone-side Intercom call indicates the phone is responsible for telling the recipient that an
intercom call is being placed, while a server-side intercom call means the SIP server is
responsible for informing the recipient. Server-side calls require additional configuration of a
prefix code. After pressing the Icom button and, if required, entering the number to call, the
phone automatically adds the prefix to the called number and sends the outgoing call via the
server.
For outgoing intercom calls, an administrator can configure the following parameters:
CONFIGURATION FILE PARAMETERS
• sip intercom type
• sip intercom prefix code
• sip intercom line
Note: To configure outgoing intercom calls using these parameters, see
Intercom Calls Settings"
INCOMING INTERCOM CALLS
You can configure how the phone handles incoming intercom calls. You can receive incoming
intercom calls whether or not there are active calls on the phone. The way the phone handles
the call depends on the incoming intercom call configuration. The following paragraphs describe
the configuration parameters for incoming intercom calls.
Microphone Mute
You can mute or unmute the microphone on the IP phone for intercom calls made by the
originating caller. If you want to mute the intercom call, you enable this feature. If you want to
unmute (or hear the intercom call), you disable this feature.
Auto-Answer/Play Warning Tone
The auto-answer feature on the IP phone allows you to enable or disable automatic answering
for an Intercom call. If "Auto-Answer" is enabled, the phone automatically answers an incoming
intercom call. If "Play Warning Tone" is also enabled, the phone plays a tone to alert the user
before answering the intercom call. If "Auto-Answer" is disabled, the phone treats the incoming
intercom call as a normal call.
The IP phone recognizes if an incoming call is an intercom auto-answer call if the SIP INVITE
includes one of the following:
• A "Call-Info" header containing "answer-after=0".
• An "Alert-Info" header containing "info=alert-autoanswer".
• An "Alert-Info" header containing "Auto Answer" AND the"To" header containing
"intercom=true".
Note: When the IP phones recognize the second and third types of incoming intercom
calls (as per the list above), the call will automatically be answered and the call's audio
will be played through the IP phone's speaker (i.e. the user's audio preferences will be
ignored).
WEB UI PARAMETERS
• Type
• Prefix Code
• Line
on page 5-96.
Operational Features
"Configuring
5-95