XIII. IPPBX

VigorBX 2000 - Registering Remote Extensions

Products:
VigorBX 2000
Keywords:
ACL
ALG
SIP
SIPALG
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The ability to easily add extensions that are situated on remote sites is a significant benefit of using the VigorBX 2000.
Remote registrations are disabled by default on the VigorBX 2000 to prevent any unauthorised access into the system.

When enabling remote registration on the VigorBX 2000, the Extension Profile for each extension that registers remotely must be specifically configured to allow registration via either VPN or the WAN. It is best practice to use a strong password for all extensions.


The PBX system allows two methods for remote registrations:

NOTE: It is recommended that registration via the Internet should use a VPN connection.

  • VPN - Using another DrayTek Vigor router on a remote site and creating a LAN to LAN VPN link creates a securely encrypted connection between the VigorBX 2000 and the remote site. This allows multiple phones to register to the PBX system and operate as though they were connected to the PBX system locally. It also provides a method through which the phones could be securely managed from the main site.
  • WAN - This can be used to register extensions directly from the WAN side of the VigorBX 2000. If the WAN connection is an Internet connection then this would permit registration from the Internet. This requires either SIP-ALG support on the remote site's router or STUN on the IP Phone itself. If the remote site has multiple IP Phones then the VPN method would be more appropriate.

Registering over a VPN

VPN Configuration

The VigorBX 2000 PBX system has the same LAN to LAN VPN functionality as the Vigor 2860 router which allows it to make Dial-Out VPN connections and operate as a Dial-In VPN server. The LAN to LAN VPN configuration would need to be set up before the two sites can create a secure VPN tunnel to communicate.

Please check this guide for an overview of how a LAN to LAN VPN connection works and would be configured: DrayTek LAN-to-LAN VPN Overview

This requires a router that supports LAN to LAN VPN using either IPsec (recommended), PPTP or SSL (DrayTek only) VPN tunnels.

The following guides demonstrate how to configure a LAN to LAN VPN connection between DrayTek routers:

PBX Configuration

The VigorBX 2000 PBX system will only allow IP phones that are in its local subnet(s) to register, by default.

This means that if a phone attempts to register over a VPN or over the internet (WAN interface), the PBX system will ignore the registration attempts.

To change this behaviour, go to [IP PBX] > [PBX System] > [SIP Proxy Setting]:


These settings control the PBX system's SIP registration for IP phones. Untick the Disable remote registration tickbox to enable registration over VPN or WAN and Tick "Enable ACL" to allow only local and VPN registrations:

  • Untick the Disable remote registration tickbox to enable registration over VPN or WAN
  • The SIP Local Port setting is the port that the PBX system listens on for SIP registrations and communicates to IP phones with. This guide explains how to change this setting if required: Changing SIP Ports on the VigorBX 2000
  • The SIP Proxy Realm is the hostname that the PBX system will allow IP Phone's to register with, if registering remotely. If the hostname being used to register does not match the SIP Proxy Realm address, the PBX will send a Forbidden response to the IP Phone trying to register
  • RTP Local Port Start/End controls the port range used for RTP (Real Time Protocol) audio streams. This should not be changed from its default
  • Limit SIP Request WAN limits the number of SIP requests that the PBX system can respond to from a remote IP address per second. This should be enabled, the default value is 5 SIP packets per second
  • Enable ACL operates as a White List, which if enabled will only allow local and VPN registrations. Registrations from internet IP addresses must be specified in the ACL.
  • Automatic block Extension for wrong password will block an extension from registering if an IP phone attempts to register with the incorrect password more than the number specified. When blocked, the extension can only be unblocked by restarting the PBX system

Click OK to save that setting, which will prompt to restart the PBX system. Click OK again to restart the PBX system and apply the setting change.


Once the PBX system has restarted, the Extension Profiles will need to have VPN registration enabled. Go to [IP PBX] > [Extension] and click on the Index number for the extension to modify:


In the Extension Profile settings, the options to Allow Remote Registration will now be available. Tick the VPN option:

Click OK to save and apply that change. IP Phones will now be able to register with that Extension Profile across a VPN connection.


IP Phone Configuration

In the web interface of the phone, simply connect the phone as it would normally connect to the PBX system on the local network, with the phone registering to the PBX system's local IP address:

The routing of the VPN connection will allow the IP Phone to register as though it were connected to the VigorBX 2000's local network.

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