Specifications

MBG Engineering Guidelines, Release 8.0
4 Remote Phone Access
A major purpose of the MBG is to allow remote MiNet IP and/or SIP phones to connect to the office PBX over an
insecure wide-area network such as the Internet, as if they were physically in the office. Most current (and many
older) models of IP sets are supported by MBG. However, please refer to the Remote IP Phones Configuration
Guide for guidance on specific models. Most SIP devices, including all Mitel-branded SIP devices, can also be
configured to work with MBG.
This section provides general guidelines for the Teleworker service. Please refer to Sizing Your Installation to
determine detailed requirements and performance limits.
4.1 Remote Site Requirements
Router
A set in a remote site (such as a home or branch office) is assumed to be part of a wired or wireless LAN behind
a simple NAT router that provides access to the Internet, typically through a DSL or cable modem.
Mitel IP and SIP phones generally require a 10/100/1000 Mbps Ethernet connection, although some models can
be configured for WiFi. (Refer to the device's documentation for configuration details.) All devices expect a
TCP/IP network regardless of the link-layer technology.
The remote site router must provide, at minimum:
• 10/100/1000 Mbps Ethernet with RJ45 connectors, for Mitel sets and connection to cable/DSL modem
• NAT from the internal network to the external network
• passthrough of UDP and TCP protocols, including TFTP
The router should provide DHCP service, offering at least an IP address and default gateway. However, devices
can be programmed with static IP addresses and settings in the absence of DHCP.
The router may need to support PPPoE/PPPoA when used with a DSL modem, and must be configured with the
user name and password provided by the ISP.
The router may need to support Authenticated DHCP (client) when used with a cable modem, and must be
configured with the user name and password provided by the ISP.
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Figure 12: Example of a remote site