3Com OfficeConnect Remote 812 manual

6-26CHAPTER 6: MANUAL SETUP

Configuring the 812 The OCR 812 can be configured to use SIP phones. for SIP Phone Support

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 To use a SIP phone with the OCR 812, your SIP phone must be installed on the the OfficeConnect LAN (private) side of the 812.

Remote 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