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MAPD-BD (MAPD Interface Circuit Pack TN802)
Issue 1 June 2005 1509
Table 544: IP trunk feature/performance limitations on page 1509 describes the feature
limitations for S8700 Media Server.
Table 544: IP trunk feature/performance limitations
Feature/
Performance
Description Recommendation
Abbreviated
Dialing
Abbreviated Dial strings with
embedded pauses lose digits
after the pause
Most calls work. Do not create Abbreviated
dial strings with embedded pauses.
Compression
limitations
Every IP trunk call goes
through A/D conversion,
which uses compression to
reduce bandwidth. Each
compression degrades the
voice signal and creates call
processing delay.
No more than 3 compression/
decompression cycles for any call.
The compression/decompression that most
voice mail systems use must be counted
as 1 cycle.
Call Classifier IP trunk’s compression/
decompression cycle makes
ringback, busy and voice
detection
Do not administer these features:
● Call Coverage Redirected Off-Net
(CCRON)
● Certain wireless phone coverage
Call Coverage
Call
Forwarding
Call Transfer
Calls extended across
multiple DCS nodes or across
multiple facilities require
multiple call paths. Significant
voice quality degradation is
likely.
Multiple call paths not recommended
Conferencing Voice quality and delay
problems if the party
controlling the conference is
on the IP trunk (voice paths
from external callers come in
on the IP trunk, are
conferenced, then sent out to
other external parties across
an IP trunk)
Avoid conference calls where at least two
other parties are on the other side of the IP
trunk.
The following conferences work OK:
● Conferences of parties on the local
media server
● Conferences controlled by the local
media server, involving local parties
and only 1 party on the other side of
an IP trunk
DCS Know limitations:
● Auto Callback
Coordinate specific administration and
between the IP trunk and Communication
Manager for any DCS functionality. Some
limitations on routing flexibility may apply.
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