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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1386IP trunk service
20
Now consider an example where off-premise dialing is configured. When O1 calls
T2 over the IP network (via the T1 switch), the user at O1 dials the exchange of
T2, not T1. Therefore, O1 has to be administered to route the call through T1, and
T1 has to change the digit string to route the call to T2. Similarly, let’s say O3
calls T4 via the T1 switch. The caller dials the local international access code and
the country code for T4. The DEFINITY IP Trunk application at T1 converts O3’s
international access code to the code appropriate for its own location, and
preserves the country code for T-4.
!
CAUTION:
Lucent recommends that you avoid more than 3 consecutive analog voice to
data packet conversions on voice calls. Repeated compression and
decompression of a voice call may seriously degrade sound quality.
Examples of conversions are: routing a voice (analog) call over a TCP/IP
format such as an IP or ATM trunk, recording a voice call into an Intuity
AUDIX, or playing back a voice call from an Intuity AUDIX.
You can configure DEFINITY ECS and the DEFINITY IP Trunk application to
allow off-premise dialing to some destinations but not to others. For example, you
can administer a remote switch to allow off-premise dialing to any exchange in its
own area code but not to any other area code. Refer to DEFINITY ECS
Administration for Network Connectivity for more information about planning and
administering call routing on IP trunks.
You can allow users to dial off-premise numbers directly as described above. You
can also use indirect, or two-stage, dialing. Two-stage dialing requires users to
dial 2 phone numbers and a security code, as opposed to dialing the off-premise
(at the remote site) number exactly as they would without DEFINITY ECS.
Two-stage dialing is more difficult and requires users to learn a new dialing
procedure, but it is somewhat more secure.
!
SECURITY ALERT:
All off-premise dialing at the remote site, regardless of which method is used,
has the potential for toll fraud. Refer to the BCS Products Security
Handbook and to ‘‘
Enhancing system security’’ in this manual.
Rerouting calls when IP transmission quality is
poor
With Configuration Manager, you can administer the DEFINITY IP Trunk
application to monitor packet loss and transmission time on an IP trunk group and
compare network performance with preset criteria for both measurements. If
either packet loss or transmission time exceeds the criteria you’ve set, the IP trunk
application blocks access to the trunk group until transmission quality improves.