Alcatel 060170-10, User Manual, Page: 96 / 430

VoIP Networks with PSTN — Example 13
Page 3-32
North American PSTN Calls — Overview
In this dialing scheme two voice switching daughtercards are used to translate area codes and
telephone numbers. All eleven digits in the telephone numbers are unique across the VoIP
network, and the voice switching daughtercards are responsible for all telephone number
routing. 411 and 911 calls can be handled as well using this dialing scheme. Calls that are not
routed across the VoIP network will be dropped and inserted, referred to as “Drop and
Insert,” into the PSTN. Minimal to no PBX re-configuration is required; however, due to less
than 99.995% reliability of Voice over IP networks, this dialing scheme is not recommended
unless “passthrough” is used on some channels. (Passthrough
not available this release ).
To call a 2000 extension off of PBX#1, the caller dials an eleven digit NANP telephone
number. In the overview diagram below, the voice daughtercard strips off the first seven
digits, and then forwards the last four digits of the dialed number.
Example 13 — North American PSTN Calls (Overview)
LEGEND for Diagram Components
PBX #1 Configuration PBX #2 Configuration
— Expects to receive four digits on trunk (J) and then
uses these digits to route calls to lines (A) .
— Expects to receive four digits on trunk (L) and then
uses these digits to route calls to lines (B) .
— Routes all calls starting with 2 to lines (A) . — Routes all calls starting with 2 to lines (B) .
N. Amer.
411, 911
1-npa . . .
0 . . .
(J)
(L)
(R)
Voice
Daughtercard
#1
IP 192.168.11.2
Port 1720
Voice
Daughtercard
#2
IP 192.168.12.2
Port 1720
WAN
T1
T1
T1
T1
Extensions
off of PBX #1
(A)
PBX #1
2000-
2998
2999
Extensions
off of PBX #2
(B)
PBX #2
2000-
2998
2999
PSTN
(T)
Intl.
1-818-878
603-598
0 . . .
2000-2999
411, 911, 1-npa . . .
ISDN
PSTN
1-xxx-xxx
stripped
digits
1-xxx-xxx
stripped
digits
0 . . .
2000-2999
411, 911, 1-npa . . .
See Diagrams:
No. Amer. Calls
(Outbound)
(Inbound DID)
011 . . .
001 . . .
(VoIP Network)
(R)
(T)