Avaya Communication Manager Administrator's Manual page 336

Managing MultiMedia Calling
8. Dual address with TAC or AAR/ARS and CDR account code
Dial mm-multinbr button or FAC, Hear dialtone
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Dial CDR FAC, Hear dialtone
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Dial CDR account code, Hear dialtone
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Dial TAC or AAR/ARS, Dial 1st dest. digits
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Dial TAC or AAR/ARS, Dial 2nd dest. digits
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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 H.320 field set to y. If so, the system
converts the call to voice and 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 Early Answer field set to y, the system answers the incoming multimedia call
on behalf of the station and 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 H.320 field is not set to y for the telephone of a Basic multimedia complex, H.320 calls
alert at the 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.
336 Administrator Guide for Avaya Communication Manager