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Biamp Systems

MS-1 network considerations for VoIP

This article describes the supported VoIP network topologies used by the Vocia MS-1.

The MS-1 is fitted with four RJ45 Ethernet ports to accommodate multiple network topologies. This document outlines the requirements for configuring the MS-1 IP Control network and VoIP interface and will be focusing on the role of the LAN-1 and LAN-3 ports.

LAN-2 is used for connection to a CobraNet network to allow sharing of control and audio data to other Vocia devices.  It is recommended that each of the MS-1 LAN ports be connected to separate networks as shown below:

 MS-1 and LAN 1, LAN 2 and LAN 3 Connections

Topologies

The MS-1 Supports 2 main topologies for VoIP interfacing.

  1. Separate Control and VoIP - VoIP network connected to LAN 3 port (preferred)
  2. Combined Control and VoIP - VoIP and control networks connected to LAN 1 port, nothing connected to LAN 3 port

Separate Control and VoIP

Single VoIP subnet

VoIP and Control on different networks, single VoIP network

This is the recommended method to configure a Vocia system that requires VoIP paging. This example assumes a valid IP connection is configured between the MS-1 and the control computer and that the Vocia software is online.

The MS-1 supports segregating traffic to separate networks. In this configuration the LAN-1 Control Port and LAN-3 VoIP port are on different physical network segments. The VoIP port must be configured to use different IP and Gateway settings to the Control network. All the VoIP phones that communicate to the MS-1 are on the same network as the Call Manager and the MS-1 VoIP port.

 clipboard_1370493804025.png

Using the Vocia Software, in the MS-1 Properties dialog > VoIP General section, Enable VoIP and confirm the VoIP Network settings Radio button is set to Use Dedicated VoIP Network Connection (LAN-3). The examples will show LAN-1 using the default MS-1 IP address of 192.168.1.101 while LAN 3 will use the IP address of 10.10.1.100 and 10.10.1.1 gateway.

 clipboard_1370494601681.png

Multiple VoIP subnets

VoIP and Control on different networks, multiple VoIP subnets

In facilities that utilize a more advanced VoIP configuration, there may be a requirement for a VoIP network that spans multiple networks.

If multiple subnets are required this can be supported by one of two topologies:

  1. Defining multiple routes within a single router (this is a function of an external router). See the Multiple VoIP networks with single gateway section.
  2. Defining multiple VoIP routes to each Gateway in the MS-1. See the Multiple VoIP networks with multiple gateway section.
Single gateway

Multiple VoIP networks with single gateway

A local router can be configured to route from the local VoIP network to multiple destination gateways. This would be a function of the network router as the MS-1 VoIP interface is only required to reach the local 10.10.1.1 gateway. The following diagram shows a common example where VoIP phones, the Call Manager and the MS-1 are on different networks. In this case there are three additional gateways defined in the network router so that the default 10.10.1.1 gateway routes to destinations 10.10.2.1, 10.10.3.1 and 10.10.4.1 .

 clipboard_1370493516125.png

Setup for Control and VoIP on different networks with a single gateway. Additional routes will be required to allow communication between Network Segments.

Multiple gateways

Multiple VoIP networks with multiple gateways

The MS-1 has the ability to specify static VoIP Routes to facilitate connecting multiple gateways with the MS-1 VoIP interface. The following diagram shows a common example where VoIP phones, the Call Manager and the MS-1 are on different networks. In this case there are four gateways employed on the network – 10.10.1.1 (MS-1 default), 10.10.1.2, 10.10.1.3 and 10.10.1.4 . The destination network routes are required to be defined in the MS-1 VoIP Options dialog so that all packets are directed to the default 10.10.1.1 VoIP gateway. 

 clipboard_1370493564327.png

Setup for Control and VoIP on different networks with multiple gateways. VoIP routes will be required to allow communication between Network Segments.

In the Vocia software, the MS-1 Properties > VoIP Options dialog allows additional VoIP routes to be specified when multiple gateways are employed. These will determine which networks and devices can reach the MS-1 as well as the communication path to the Call Manager.

 clipboard_1370494454167.png

The first setting in the Additional VoIP Routes dialog (see figure 6) is establishing communication with the 10.10.2.0 Destination Network using the 10.10.1.2 gateway. This would be required to communicate with the Call Manager and would also allow phones on the local 10.10.1.xxx or destination 10.10.2.xxx subnet to reach the MS-1. The Vocia software allows the creation of multiple VoIP routes depending on the needs of the system. The following table gives an example of options available for the diagram shown above.

Network

Subnet Mask

Gateway

Result

10.10.2.0

255.255.255.0

10.10.1.2

Needed to establish communication with the proxy. All phones in 10.10.2.xxx and 10.10.1.xxx subnet will communicate with the MS-1

10.10.2.0

10.10.4.0

255.255.255.0

255.255.255.0

10.10.1.2

10.10.1.4

Same as above plus all phones in the 10.10.4 subnet will communicate with the MS-1

10.10.2.0

10.10.3.0

10.10.4.0

255.255.255.0

255.255.255.0

255.255.255.0

10.10.1.2

10.10.1.3

10.10.1.4

All phones in the shown network could communicate with the MS-1

Combined Control and VoIP

IP Control and VoIP on the same Subnet

If the Control and VoIP ports are only able to coexist on the same network the MS-1 can be configured so that the Control and VoIP LAN share the same IP and Gateway settings. When configured in this way the LAN-1 port is used and the LAN-3 port is disabled. While supported, this configuration is only to be considered if a small number of VoIP lines are required or there is a physical networking reason limiting the connections to the MS-1. Separating the IP control and VoIP ports as outlined in the previous examples is the preferred connection method. 

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Using the Vocia Software, in the MS-1 Properties dialog > VoIP General section, Enable VoIP and confirm the VoIP Network Settings Radio button is set to Use Control Network Connection (LAN-1).

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