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6-26 CHAPTER 6: MANUAL SETUP
Configuring the 812
for SIP Phone Support
The OCR 812 can be configured to use SIP phones.
Overview A SIP phone (Session Initiation Protocol phone) is a network-capable telephone
that uses Ethernet connectivity to place and receive calls over the Internet. SIP
phones send and receive voice data as TCP/IP packets. A SIP phone can be used for
telephony, and to set up conferencing, multimedia, and other types of Internet
communication sessions. SIP may also serve as the platform of choice for new
types of communication like instant messaging, and it can be used to provide
application-level mobility across networks (such as wireless).
Using a SIP Phone with
the OfficeConnect
Remote 812
To use a SIP phone with the OCR 812, your SIP phone must be installed on the
LAN (private) side of the 812.
If you wish to use a SIP phone and address translation on your OCR 812, you must
have PAT (Port Address Translation) enabled.
CLI commands are not required for SIP phone use. To use a SIP phone with the
OCR 812, just connect the RJ-45 ports on your SIP phone to the RJ45 ports on the
812.
SIP Phone Infrastructure Major components of the SIP phone network infrastructure are as follows:
LAN
On the LAN side of the OfficeConnect 812 are SIP phones and workstations,
each having a private IP address visible only to devices on the LAN side
of the 812 (i.e., “behind” the 812).
The LAN connects to the LAN port of the 812 ADSL Router.
OfficeConnect 812 ADSL Router
The 812 ADSL Router functions as a bridge/router between LAN devices
(connected to the LAN port) and all “outside” devices accessible via the
Internet by means of the 812 WAN port connector.
WAN
The WAN port of the OfficeConnect 812 is a public IP address representing all
of the private IP addresses on the LAN side of a SIP phone connection.
“Outside” devices on the public side of the connection (the Internet side) can
see the WAN port address, but they cannot see the private (LAN) port
addresses it represents.
Proxy Server
The primary function of a proxy server in the SIP phone network infrastructure
is to map the IP address of a SIP phone to a unique alphanumeric user name
and password, and to store this information (collectively called a “caller
identity”) in the proxy server data base.
A proxy server automatically creates a caller identity for a SIP phone when the
user plugs that phone into an Ethernet port.
When a SIP phone caller places a call to another SIP phone user (by dialing their
user name and password), the proxy server looks up the intended recipient’s