Avaya Communication Manager Administrator's Manual page 288

Managing MultiMedia Calling
Enhanced Mode MM Complex
1-number access
1-number access permits originating users to make voice or multimedia calls to an Enhanced multimedia
complex by dialing the same number for either type of call. The number may be the voice station
extension or the data module extension. If the incoming call is a voice call, Avaya Communication
Manager alerts the station of an incoming voice call. If the incoming call is 56K or 64K data call,
Communication Manager recognizes it as a multimedia call, inserts resources to terminate the H.320
protocol, and alerts the voice station with a multimedia call.
Calls originating on the same media server as the Enhanced mode complex destination may always use
1-number access for voice or video. In order to take advantage of 1-number access for calls originating
from a remote location, the incoming calls must arrive over ISDN-PRI trunks. If the system is setup with
separate non-PRI digital facilities for data, multimedia calls must be made to the data extension of the
Enhanced mode complex.
AVD (alternate voice/data) trunk groups cannot be used to provide 1-number access with MMCH. If the
AVD trunk group has a BCC of 0, all calls arriving over the AVD trunk to the Basic mode complex will
be assumed to be voice calls. If the AVD trunk group has a BCC of 1 or 4, all calls arriving over the AVD
trunk to the Basic mode complex will be assumed to be multimedia calls.
ORIGINATION
The basic call sequence from an Enhanced mode complex is to originate a multimedia call and alert the
destination. When the destination answers the call, the originating station's H.320 desktop video system
will be alerted (that is, called by Communication Manager to establish the service link). If the H.320
DVC is not configured for auto-answer, the user must answer the H.320 calls via the DVC GUI. If the
H.320 DVC is configured for auto-answer, no action is needed via the DVC GUI. Avaya
recommends, but does not require, that Enhanced mode complexes place their desktop
video system into an auto-answer mode of operation. If the far-end is providing a video signal,
the 2-way video will be observed. If the destination is not providing a video signal (call was answered by
a simple voice phone), then loopback video will be provided at the Enhanced mode complex originator.
The audio signal will exist at the handset of the voice phone. The audio signal may be moved to the
H.320 DVC system via activation of a mm-pcaudio button on the voice phone. See the section below on
mm-pcaudio.
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 server, 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.
288 Administrator's Guide for Avaya Communication Manager
November 2003