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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Managing multimedia calling
265Enhanced Mode MM complex
9
Hourglass tone. The originating party may hear different things when the
incoming multimedia call is answered depending on the nature of the answering
party. If the call is being answered directly by an H.320 DVC system or if the
answering party is an Enhanced mode complex on a remote switch, an immediate
audio path will not exist between the two parties. This is because the H.320
protocol must be established after the call is answered. It takes several seconds for
the H.320 protocol to establish an audio path. During this interval the originating
party will hear special ringback. When the audio path exists the special ringback
will be removed and replaced with a short incoming call tone indicating that audio
path now exists. The combination of special ringback followed by incoming call
tone is referred to as “hourglass tone.” Hourglass tone is an indication to the
originating party that they should wait for the H.320 call to establish audio.
- originating voice calls
Voice calls are originated from the voice station of an Enhanced mode complex in
the normal manner as for any voice station.
- originating multimedia calls
Multimedia calls from an Enhanced multimedia complex are originated from the
VOICE STATION, NOT the H.320 desktop video system. All multimedia
originations require the user to indicate the multimedia nature of the call prior to
providing any address digits. There are several different ways to originate a
multimedia call from the voice station.
1.
mm-call (Multimedia Call) button. If the station has an mm-call button
administered, the user goes off-hook and selects the mm-call button. The
user may select the mm-call button and then go off-hook. If the user has a
speakerphone on the station, the user may originate the call simply by
selecting the mm-call button. The speakerphone will automatically be
placed off-hook and dialtone will be heard. Upon selection of the mm-call
button, the mm-call status lamp (green led) will light steadily, indicating a
multimedia call.
The user now dials the destination address digits. The destination address
may be provided by dialing digits, using abbreviated dial entries, last
number dialed, station busy indicators, etc. Originating a multimedia call
with the mm-call button will originate a call according to the Default
Multimedia Parameters selected on the System Parameters Features form.
This default parameter will be either 2x56 or 2x64. The bearer capability of
the multimedia calls will either be 56K or 64K and the bandwidth will be
2B channels.
For calls with a bandwidth of 2B, use of the mm-call button to originate
will cause the same destination address to be used for both channels of the
2B call. See the section below on the mm-multinbr button/FAC for
information on originating a 2B call where the destination has a different
address for each B-channel.