Avaya IP Line Bedienungsanleitung Seite 301

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Codecs Page 301 of 910
IP Line Description, Installation and Maintenance
Known issues include:
After an on-hold and off-hold scenario (that triggers Master/Slave
negotiation), the codec used for the restored call can be different than the
codec used before the call was placed on hold. The Master/Slave
information could have been changed when the call was on hold.
Since the terminating end of a call is always the Master, a call from
Telephone1 (Node1) to Telephone2 (Node2) can use a different codec
than a call from Telephone2 (Node2) to Telephone1 (Node1).
For tandem calls, the Master/Slave information is not relevant. That is,
the Master/Slave information is designed to be used only between two
nodes, not among three or more nodes. The Master/Slave algorithm
makes the codec selection for tandem calls more complex and inefficient.
To solve the issues, another codec selection algorithm was needed. This
algorithm is called the Best Bandwidth codec Selection algorithm and is not
based on the unpredictable Master/Slave information.
The Best Bandwidth codec Selection algorithm is used for virtual trunk calls
between Nortel equipment, since any change to the Master/Slave algorithm
implies a change to the H.323 standard. The H.323’s Master/Slave algorithm
is used when there is a virtual trunk call between Nortel equipment and
third-party equipment.
Best Bandwidth Codec Selection algorithm
The Best Bandwidth Codec Selection algorithm was implemented to solve
the issues caused by the H.323 Master/Slave algorithm. The Best Bandwidth
Codec Selection algorithm selects one common codec based on two codec
lists. With this algorithm, every time the selection is done using the same two
lists, the selected codec is always the same.
The “Best Bandwidth” codec selection is based on the codec type only; it does
not take into account the fact that some codecs, while generally using less
bandwidth, consume more bandwidth than others at certain payload sizes.
The Best Bandwidth Codec Selection algorithm finds the first codec in
the near-end list that is also in far-end list (codec is the same type and has
the same payload size). Call the selected codec C1.
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