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This topic describes unified gateway interconnection scenarios and data planning in a dual-center remote disaster recovery network under a multi-node centralized call management scenario.
Configuration Scenario
Data configuration objectives are as follows:
ϒ⁄Intra-office calls can be made by dialing short numbers between IP phones, POTS phones, and fax machines at the central node A, central node B, branch 1, and branch 2.
ϒ⁄Incoming and outgoing calls can be made after the active node is connected to local nodes through SIP trunks and after local nodes are connected to the PSTN through PRA trunks.
ϒ⁄Active and standby nodes implement remote disaster recovery. The standby node can take over user service requests when the active node is faulty.
Data Plan
Table 1 IP addresses
Location |
NE |
IP Address |
Subnet Mask |
Gateway IP Address |
Central node A |
Active node |
10.10.10.5 |
255.255.255.0 |
10.10.10.1 |
Local node 1 |
10.10.10.2 |
255.255.255.0 |
10.10.10.1 |
|
Central node B |
Standby node |
10.10.20.5 |
255.255.255.0 |
10.10.10.1 |
Local node 2 |
10.10.20.2 |
255.255.255.0 |
10.10.10.1 |
|
Branch 1 |
Local node 3 |
192.168.1.2 |
255.255.255.0 |
192.168.1.1 |
Branch 2 |
Local node 4 |
172.16.1.2 |
255.255.255.0 |
172.16.1.1 |
Table 2 User numbers
Location |
Connected Endpoint |
Short Number |
Long Number |
User Rights Level |
Central node A |
IP phone |
81000 |
28881000 |
Default rights |
IAD (fax machine) |
81001 |
- |
||
IAD (POTS phone) |
81002 |
- |
||
Automatic switchboard access code |
- |
28882999 |
||
Central node B |
IP phone |
82000 |
288821000 |
|
IAD (fax machine) |
82001 |
- |
||
IAD (POTS phone) |
82002 |
- |
||
Automatic switchboard access code |
- |
28883999 |
||
Branch 1 |
IP phone |
83000 |
28883000 |
|
IAD (fax machine) |
84000 |
28884000 |
||
IAD (POTS phone) |
84001 |
28884001 |
||
Fax machine |
85000 |
- |
||
POTS phone |
85001 |
- |
||
Automatic switchboard access code |
- |
28885999 |
||
Branch 2 |
IP phone |
86000 |
28886000 |
|
IAD (fax machine) |
87000 |
28887000 |
||
IAD (POTS phone) |
87001 |
28887001 |
||
Fax machine |
88000 |
- |
||
POTS phone |
88001 |
- |
||
Automatic switchboard access code |
- |
28888999 |
Table 3 SIP trunks
Location |
NE |
Peer Office |
Trunk Type |
Office Route Selection Code |
Office Route |
Central node A |
Active node |
Local node 1 |
SIP |
1 |
1 |
Local node 2 |
SIP |
2 |
2 |
||
Local node 3 |
SIP |
3 |
3 |
||
Local node 4 |
SIP |
4 |
4 |
||
Local node 1 |
Active node |
ϒ⁄After the active and standby nodes are added, the system automatically creates the SIP trunks, office route selection codes, and office routes for the active and standby nodes. ϒ⁄If the U1980 functions as the local node, you need to manually create the SIP trunk, office route, and office route selection code in versions earlier than V200R003C20SPC200; in V200R003C20SPC200 and later versions, the system automatically creates them. |
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Standby node |
|||||
Central node B |
Local node 2 |
Active node |
|||
Standby node |
|||||
Branch 1 |
Local node 3 |
Active node |
|||
Standby node |
|||||
Branch 2 |
Local node 4 |
Active node |
|||
Standby node |
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Table 4 PRA trunks
Location |
NE |
Peer Office |
Trunk Type |
Office Route Selection Code |
Office Route |
CRCa |
Connection Locationb |
Central node A |
Local node 1 |
PSTN |
PRA |
0 |
0 |
No |
Local office: on the user side; PSTN: on the network side |
Central node B |
Local node 2 |
PSTN |
PRA |
0 |
0 |
No |
Local office: on the user side; PSTN: on the network side |
Branch 1 |
Local node 3 |
PSTN |
PRA |
0 |
0 |
No |
Local office: on the user side; PSTN: on the network side |
Branch 2 |
Local node 4 |
PSTN |
PRA |
0 |
0 |
No |
Local office: on the user side; PSTN: on the network side |
ϒ⁄a: indicates the cyclic redundancy code (CRC) for the unified gateway. The CRC must be the same as that of the peer device. ϒ⁄b: ensures that the value on the local device is different from that on the peer device. |
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Table 5 Prefix and number change
Location |
NE |
Prefix Type |
Prefix |
Office Route Selection Code |
Called Number Change |
Calling Number Change |
Remarks |
Central node A |
Active node |
Intra-office call prefix |
8 |
- |
- |
- |
- |
2888 |
|||||||
National toll call prefix |
90 |
5: outgoing calls to local node 1 |
- |
- |
The national toll call rights can be assigned only to specified users by configuring the user rights level, preventing toll fraud. |
||
International toll call prefix |
900 |
The international toll call rights can be assigned only to specified users by configuring the user rights level, preventing toll fraud. |
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Local outgoing call prefix |
9 |
The central node does not delete the outgoing call prefix 9 for an outgoing call. The prefix 9 is deleted on the local node. |
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Outgoing call prefix: Users at branches call PSTN users at the central node A. |
9010 (010 is the area code of the central node A) |
1: outgoing calls to local node 1 |
- |
- |
- |
||
Outgoing call prefix: Users at branches call PSTN users at the central node B. |
9021 (021 is the area code of the central node B) |
2: outgoing calls to local node 2 |
|||||
Outgoing call prefix: Users at branches call PSTN users at the branch 3. |
90571 (0571 is the area code of branch 3) |
3: outgoing calls to local node 3 |
|||||
Outgoing call prefix: Users at branches call PSTN users at the branch 4. |
90755 (0755 is the area code of branch 4) |
4: outgoing calls to local node 4 |
|||||
Local node 1 |
Intra-office call prefix |
8 |
- |
- |
- |
- |
|
Local regeneration prefix |
2888 |
The local regeneration prefix is the intra-office call prefix configured on the active node for users at the local node. |
|||||
National toll call prefix |
90 |
0 |
Index 0: Deletes the first digit of a number. |
Index 1: Changes the number to the automatic switchboard access code 28882999 of the central node A. |
Outgoing calls to the PSTN |
||
International toll call prefix |
900 |
||||||
Local outgoing call prefix |
9 |
||||||
Local outgoing call prefix |
9010 |
||||||
Central node B |
Local node 2 |
Intra-office call prefix |
8 |
- |
- |
- |
- |
Local regeneration prefix |
2888 |
The local regeneration prefix is the intra-office call prefix configured on the active node for users at the local node. |
|||||
National toll call prefix |
90 |
0 |
Index 0: Deletes the first digit of a number. |
Index 1: Changes the number to the automatic switchboard access code 28883999 of the central node B. |
Outgoing calls to the PSTN |
||
International toll call prefix |
900 |
||||||
Local outgoing call prefix |
9 |
||||||
Local outgoing call prefix |
9021 |
||||||
Branch 1 |
Local node 3 |
Intra-office call prefix |
8 |
- |
- |
- |
- |
Local regeneration prefix |
2888 |
The local regeneration prefix is the intra-office call prefix configured on the active node for users at the local node. |
|||||
National toll call prefix |
90 |
0 |
Index 0: Deletes the first digit of a number. |
Index 1: Changes the number to the automatic switchboard access code 28885999 of the branch 1. |
Outgoing calls to the PSTN |
||
International toll call prefix |
900 |
||||||
Local outgoing call prefix |
9 |
||||||
Local outgoing call prefix |
90571 |
||||||
Branch 2 |
Local node 4 |
Intra-office call prefix |
8 |
- |
- |
- |
- |
Local regeneration prefix |
2888 |
The local regeneration prefix is the intra-office call prefix configured on the active node for users at the local node. |
|||||
National toll call prefix |
90 |
0 |
Index 0: Deletes the first digit of a number. |
Index 1: Changes the number to the automatic switchboard access code 288859999 of the branch 2. |
Outgoing calls to the PSTN |
||
International toll call prefix |
900 |
||||||
Local outgoing call prefix |
9 |
||||||
Local outgoing call prefix |
90755 |
Table 6 Call sources
NE |
Call Source |
Remarks |
|
Active node |
1 |
Users at central node B belong to call source 1. |
Configures call rerouting analysis. When a user at central node B dials prefix 9 to make an outgoing call, the call is rerouted to local node 2. |
2 |
Users at branch 1 belong to call source 2. |
Configures call rerouting analysis. When a user at branch 1 dials prefix 9 to make an outgoing call, the call is rerouted to local node 3. |
|
3 |
Users at branch 2 belong to call source 3. |
Configures call rerouting analysis. When a user at branch 2 dials prefix 9 to make an outgoing call, the call is rerouted to local node 4. |
|
Local node 1 |
1 |
The SIP trunk from local node 1 to the active node and standby node belongs to call source 1. |
Adds SIP trunks from the local nodes to the active node and standby node to call source 1. When a local node processes a call from this call source, the local node changes the call attribute of local regeneration prefix 288 to inter. |
Local node 2 |
1 |
The SIP trunk from local node 2 to the active node and standby node belongs to call source 1. |
|
Local node 3 |
1 |
The SIP trunk from local node 3 to the active node and standby node belongs to call source 1. |
|
Local node 4 |
1 |
The SIP trunk from local node 4 to the active node and standby node belongs to call source 1. |
|
Table 7 Boards
Location |
NE |
Board Type |
Slot Number |
Central node A |
Local node 1 |
MTU |
0 |
Central node B |
Local node 2 |
MTU |
0 |
Branch 1 |
Local node 3 |
MTU |
0 |
ASI |
1 |
||
Branch 2 |
Local node 4 |
MTU |
0 |
ASI |
1 |
Parent Topic: Configuring Dual-Center Remote Disaster Recovery