Howto:Master - Slave Numbering Scheme with one Node and more Pbx/Locations

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Applies To

This information applies to

  • IP 6000, V6
  • IP 3000, V6
  • IP 800, V6
  • IP 305, V6
  • IP 302, V6
  • IP 202, V6

Build 06-60400.31 or later

Keywords: master slave

More Information

How to configure a Numbering Node with one Node and more Pbxs

On every site (physical location) is an innovaphone PBX.

Gateway with ISDN connection (Local ISDN Trunk) and one virtual PBX over all locations.

That means every number in this dialplan is unique.

Every endpoint dials only the number of any phone in any physical location.

Also every endpoint dials the trunk line number (e.g 0) and gets a local break out.


General explanation of the numbering node and PBX

go to Howto:Description of the Numbering Scheme used in V6

Problem Details

If for every remote location a local ISDN breakout is needed –

therefore it takes a little tricky configuration.


Configuring the MasterPbx


PBX Mode Master

System Name is the Gatekeeper Id (AT01)

And the PBX name (A)

Here you define the PBX name , later in the user objects you configure on what PBX (PBX name) the phones should register.

Registering/Configuring Endpoints (e.g Phones) on the Master PBX.


User Object

The node: You can have different nodes on one Gateway (PBX) to have more virtual PBX.

For example having same extensions.

Also you can have one node per PBX

The node root is the upper tree node, all other nodes are below the root node – this are

all own virtual PBX. So if in a node a number is not found it will go to the upper node .

On the Pbx field you define on what Pbx the Phones register, here it is the local

Pbx (A).

Then you have to define the Pbx of the remote Location in the Master


Pbx Object

The name and long name is the same as the pbx name on the remote location.

Node is the root and the Pbx is the master Pbx (A), Password is not needed, if you take

a Password then you have to configure this in the Slave Pbx also

(andminstration/pbx/general slave Pbx Password)

Configuring the slave Pbx

Pbx password

Image:Locations 5.png

The Pbx Password of all the slaves must be the same as on the Master Pbx.

Configuring the Slave Mode


Pbx Mode is Slave,.

System Name (Gatekeeper ID) is the same as on the Master

Slave Pbx , Master: Here put the IP Address of the Master Pbx

Having an alternate Master (Standby Pbx put here the IP Address of the Masters

Standby Pbx)

Password : If you configured a password on the Pbx Object in the Master Pbx then put

the same here.

Configuring Ldap

All the User Objects of all Locations get configured in the Master Pbx (A)

The remote locations (slaves) get this user objects automatically in their Pbx –

therefore we work with LDAP replication.

Configure the Ldap replication on a Slave Pbx



The default Ldap user is ldap-guest and the password is ipxxx

Activate write access.

In the Replicator configure the Ldap Master


Server : IP address of the Master Pbx

Location: if it is empty all user data from the Master pbx will be replicated.

Here you only need the User data of this slave pbx (B) - own user data.

User and password as above.

To see if the Ldap replication works go to Replicator Status

Full Replication must be UP


Configuring /Registering a Endpoint (e.g Phone) for the Pbx B

In the Master Pbx open a New User Object


User Object

Node root and Pbx B (the Pbx of the remote Location – Slave Pbx where the Phone should register)

Configuring local Trunk User for every Pbx

Every Phone on every Pbx is in the node root –so they can call each other only by calling the extension.

The Trunk users must be in different nodes, because there can only be one Trunk user with one unique number in one node.

So therefore configure one Trunk user in the node root and one Trunk user in another node (for example here B).

If a user from the Slave Pbx (B) dials 0 - gets the routing via the Trunk user in location B.

If the user in Location A is dialing the 0 there is no 0 in node A so the calls goes automatically to the upper node –

and there in the root node is the Trunk User for the Master location (A).

Configuration on Master

Trunk User on Master

Image:Locations 11.png

Trunk Object –must be registered in the relay or direct at the Interface for dialing out/in

Trunk user for Slave Pbx

Image:Locations 12.png

The Long Name /Name must be different

As node chose here B

As Pbx B (slave Pbx to register)

The Local Flag MUST be on !

Like this it should be on the Master Pbx

Registered Trunk user

Registered phones

And registered Location (B) Slave Pbx

Image:Locations 13.png

Configuration in the slave Pbx

Here you have also configure the relay or Interface registration to the Trunk User.

In the Relay configuration for the Trunk User take only the Trunk Name not the Trunk number.

And if the configuration is right you see that the Master is up the local Trunk user and the local Phones are registered.

Image:Locations 14.png

Phone Config

Gatekeeper Address

In order for local objects to work properly, it is essential that all endpoints (including mobile endpoints like softclients on laptops or WLAN phones) always register first with their "local" gatekeeper, as the first gatekeeper to see the registration request will determine the current locality of the client. This implies that you must not configure a fixed IP address as primary gatekeeper.

Instead, you should leave the primary gatekeeper. To make sure the local gatekeeper is found, there are several options:

  • use gatekeeper discovery. This requires the local gatekeeper always to be in the same network segment as the client
  • deploy the local gatekeepers address per DHCP
  • implement proper multicast forwarding in your network

See Howto:Description_of_the_Numbering_Scheme_used_in_V6#The_physical-location for more information.

If your master PBX serves as backup/standby PBX for your location, you may configure its IP address as secondary gatekeeper.


If the Slave Pbx fails the local Phones register automatically on the Master Pbx .

When a phone is making a registering to the local Pbx (Slave) then in the response it gets also the information of the alternate Gatekeeper (IP Address of the Master Pbx) also on every refresh of the phone.

With the innovaphone Locations Concept there is also redundancy included

Howto:How to configure numbering node with X nodes and X pbx.

Reference:PBX Locations

Howto:Description of the Numbering Scheme used in V6

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