Avaya Communication Manager Administrator's Manual page 280

Managing MultiMedia Calling
Understanding the Multimedia Complex
Receiving voice calls
Any voice calls directed to the voice or data extension of a Basic multimedia complex will ring at the
voice station.
Receiving multimedia calls
Any data calls directed to the voice or data extension of a Basic multimedia complex will ring at the
multimedia equipped PC if it is available. You may answer the multimedia call at the PC and voice and
video will connect to the PC. If the data endpoint is unavailable, the system verifies that the telephone of
the complex is administered with the
sends it to the telephone of the multimedia complex, where the call then alerts.
Hourglass Tone
When a voice station answers a converted multimedia call, the answering party may hear different things
depending on the nature of the originator. If the origination is directly from an H.320 DVC system or if
the originator 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
answering 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 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 answering party that they should wait for the H.320 call to establish audio.
Early Answer
The answering party may administer their station to avoid hearing hourglass tone. With the Station screen
field set to y, the system answers the incoming multimedia call on behalf of the station and
Early Answer
establishes the H.320 protocol. After audio path has been established, the call will then alert at the voice
station of the Basic complex destination. The station may then answer by going off-hook and will have
immediate audio path. No hourglass tone will be heard by the answering party.
If the field is not set to y for the telephone of a Basic multimedia complex, H.320 calls alert at the
H.320
multimedia endpoint until the caller drops. If an H.320 call is directed to a telephone with H.320 set to n,
the system denies the call.
You can assign H.320 conversion to any voice station.
Authorization
Multimedia complexes require the same types of authorization (COR/COS) as standard telephones. If a
call is addressed to the voice extension, the system checks the COR/COS of the telephone, whether the
call is voice-only or multimedia. If a call is addressed to the data extension, the system checks the
COR/COS of the data endpoint. If the call is subsequently redirected to the voice station, the system does
a second COR/COS check for the authorization of the voice station. Calls originated from the PC use the
COR/COS of the voice station.
Adjunct Switch Applications Interface
ASAI is not expected to support call-association for data calls. Therefore Avaya does not recommend that
you use ASAI for multimedia.
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field set to y. If so, the system converts the call to voice and
H.320
Administrator's Guide for Avaya Communication Manager
November 2003