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VoIP Networks without PSTN — Example 6
Page 3-17
VoIP Networks without PSTN — Example 6
One Hunt Group (144 Channels Across Six T1s)
This dialing scheme has six T1 lines connected to one PBX. In this dialing scheme, one hunt
group spans six T1 lines using three voice switching daughtercards (spanning two T1 lines
each). In this example, the cards are installed in a two VSX motherboards in the same Omni
Switch/Router to provide six T1 lines connected to a PBX.
Hunt groups are called voice numbering plans in the AVNDS. Voice numbering plans relate
phone groups and destinations. In this example, the voice daughtercards are using the round
robin hunt method to determine where new calls will be routed.
Example 6 — One Hunt Group (144 Channels Across Six T1s)
LEGEND for Diagram Components
PBX #1 Configuration PBX #2 Configuration
— Expects to receive four digits on trunks (J) , (K) ,
(L) , (M) , (N) or (O) , and then uses these digits to
route calls to lines (A) .
— Expects to receive four digits on trunk (E) and then
uses these digits to route calls to lines (B) .
— Routes calls starting with 1 to lines (A) . — Routes calls starting with 2 to lines (B) .
— Routes calls starting with 2 to trunks (J) , (K) , (L) ,
(M) , (N) or (O) , and then the VoIP network uses these
digits to route calls to trunk (E) .
— Routes calls starting with 1 to trunks (X) , and then
the VoIP network uses these digits to route calls to
trunks
(J) , (K) , (L) , (M) , (N) or (O) according to the
hunt method used.
Extensions
off of PBX #1 (A)
(J)
(K)
Extensions
off of PBX #2
(B)
(E)
(X)
PBX #1
PBX #2
1000-
1999
2000-
2999
Voice
Daughtercard
#1
IP 192.168.11.2
Port 1720
Voice
Daughtercard
#2
IP 192.168.12.2
Port 1720
T1
T1
2000 to 2999
T1
T1
Voice
Daughtercard
#3
IP 192.168.13.2
Port 1720
Voice
Daughtercard
#4
IP 192.168.14.2
Port 1720
(L)
(M)
1000 to 1999
T1
(N)
(O)
T1
T1
WAN
Hunt Group
T1