DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-997MAPD-BD (MAPD Interface Circuit Pack TN802)
9
Table 9-384. DEFINITY ECS 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 All IP trunk calls go through
A/D conversion, which u s e s
compression to reduce
bandwidth. Each
compression degrades the
voice signal and creates call
processing d elay.
No more than 3
compression/decompression
cycles for any call.
NOTE:
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 DEFINITY ECS
nodes require multip le call
paths. Significant voice
quality degradation is likely.
Multiple call paths not
recommended
Conferencing Voice quality and delay
problems if the par ty
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.
NOTE:
The following conferences
work OK:
■Conferences of parties on
the local DEFINITY ECS
■Conferences controlled by
the local DEFINITY ECS,
involving local parties and
only 1 party on the other
side of an IP trunk
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