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VoIP Networks without PSTN — Example 11
Page 3-27
VoIP Networks without PSTN — Example 11
Trunk Groups and Eleven Digit Extensions
This dialing scheme can be used with two voice daughtercards to translate seven digit trunk
prefixes and four digit extensions. The seven digit site prefix, rather than the four digits exten-
sions, are unique across the VoIP network. This enables each PBX site to handle the same or
overlapping phone extensions.
The site prefix digits are used to send the VoIP calls to the correct PBX node. When a caller
dials a specific site prefix, e.g., 1-603-598, it routes the call to the corresponding PBX and
then dials a prefix to get a specific trunk. The user would dial 1-603-598-2xxx to call an
extension off of PBX #2, for example. The VoIP daughtercard will strip the first seven digits
and forward the last four digits to the PBX.
Any number used as a site prefix cannot be used for the first digit of any valid extension.
Example 11— Trunk Groups and Eleven Digit Extensions
LEGEND for Diagram Components
PBX #1 Configuration PBX #2 Configuration
— Expects to receive four digits on trunk (D), and then
uses these digits to route calls to lines (A) .
— Expects to receive four digits on trunk (H), and then
uses these digits to route calls to lines (B) or trunk (E) .
— Routes calls starting with 2 to lines (A) . — Routes calls starting with 2 to lines (B) .
— Routes calls starting with 1-603-598 to trunk (G) , and
then the VoIP network uses these digits to route calls to
trunk
(H) .
— Routes calls starting with 1-818-878 to trunk (E) , and
then the VoIP network uses these digits to route calls to
trunk
(D) .
Extensions
off of PBX #1 (A)
(B)
2000-
2999
(D)
T1
#1
IP 192.168.11.2
Port 1720
Voice
Daughtercard
#2
IP 192.168.12.2
Port 1720
WAN
T1
(G)
Voice
Daughtercard
stripped
digits
(1-818-878) + (2000 to 2999)
PBX #1
(H)
T1
T1
(E)
stripped
digits
(1-603-598) + (2000 to 2999)
Extensions
off of PBX #2
2000-
2999
PBX #2