Cisco IP Conference Station 7935 Administation Guide
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Overview of the Cisco IP Conference Station 7935

Table Of Contents

Overview of the Cisco IP Conference Station 7935

Networking Protocols

Supported Features

Available Connections

Understanding Interactions with Other Cisco IP Telephony Products

Understanding How the IP Conference Station Interacts with Cisco CallManager

Understanding the Startup Process

Understanding the Requirements for Installing and Setting Up the Cisco IP Conference Station 7935

Overview of the Cisco IP Conference Station 7935

The Cisco IP Conference Station 7935 is an IP-based, hands-free conference station that uses Voice over IP (VoIP) technology. The IP Conference Station interacts with several other key Cisco IP Telephony components, including Cisco CallManager.

The following topics in this chapter provide information about the IP Conference Station and its interaction with other key components of the Voice over IP (VoIP) network.

Networking Protocols

Supported Features

Available Connections

Understanding Interactions with Other Cisco IP Telephony Products

Understanding the Startup Process

Understanding the Requirements for Installing and Setting Up the Cisco IP Conference Station 7935

Networking Protocols

The IP Conference Station supports several industry-standard and Cisco networking protocols required for voice communication. See the following table for an overview of the supported networking protocols.

Networking Protocol
Usage Notes

Cisco Discovery Protocol (CDP)

CDP is a device-discovery protocol that runs on all Cisco-manufactured equipment.

Using CDP, a device can advertise its existence to other devices and receive information about other devices in the network.

The IP Conference Station uses CDP to communicate configuration information to the Cisco Catalyst switch. With CDP, each device sends periodic messages to a multicast address and in turn listens to the periodic messages sent by other devices. This allows devices on the network to discover one another and learn information such as protocols used, protocol addresses, and so on.

Dynamic Host Configuration Protocol (DHCP)

DHCP dynamically allocates and assigns an IP address to network devices.

DHCP enables you to connect the IP phone into the network and become operational without manually assigning an IP address and configuring additional required network parameters.

DHCP is enabled by default. If disabled, you must manually configure the IP address, subnet mask, gateway, and TFTP server on each station.

Internet Protocol (IP)

IP is a messaging protocol that addresses and sends packets across the network.

To communicate using IP, network devices must have an assigned IP address, subnet, and gateway.

IP addresses, subnets, and gateways identifications are automatically assigned if you are using the IP Conference Station with DHCP. If you are not using DHCP, you must manually assign these properties to each station locally.

Real-Time Transport (RTP)

RTP is a standard for transporting real-time data, such as interactive voice and video over data networks.

The IP Conference Station can collect and process RTP traffic from routers, hubs, and switches.

Skinny Client Control Protocol (SCCP)

Skinny Client Control Protocol. A Cisco protocol using low- bandwidth messages that allows communication between IP devices and the Cisco CallManager.

The IP Conference Station uses SCCP to communicate with the Cisco CallManager.

Transmission Control Protocol (TCP)

TCP is a a connection-oriented transport protocol.

The IP Conference Station uses TCP to connect to Cisco CallManager.

Trivial File Transfer Protocol (TFTP)

TFTP allows you to transfer files over the network.

On the IP Conference Station, TFTP enables you to obtain a configuration file specific to the IP Conference Station type.

TFTP requires a TFTP server in your network, which can be automatically identified from the DHCP server. If more than one TFTP server is running in your network, you must manually assign a TFTP server to each station locally.

User Datagram Protocol (UDP)

UDP is a connectionless messaging protocol for delivery of data packets.

The IP Conference Station receives and processes UDP messages.

Voice over IP (VoIP)

VoIP enables you to transfer voice communications over a data network using the Internet Protocol.

The IP Conference Station connects to the PSTN through a VoIP gateway.

Supported Features

The IP Conference Station functions much like the traditional analog conferencing unit allowing you to set up and place conference calls and receive calls. The IP Conference Station also supports features such as call hold, redial, and mute.

In addition to these traditional telephony features, the IP Conference Station also includes features enabling you to administer and monitor it as an IP networking device. On the IP Conference Station, you can locally configure features such as DHCP, TFTP, and IP settings.You can also integrate the IP Conference Station with the corporate Lightweight Directory Access Protocol 3 (LDAP3) standard directory to enable users to search for co-workers' contact information directly from the IP Conference Station. From Cisco CallManager, you can modify additional settings, which are viewable from the IP Conference Station's network configuration settings. Use this guide for information about configuring these settings.

Available Connections

The IP Conference Station includes the following connnections for accessing the data network and providing power to the station:

Power Interface Module (PIM) for connection between the IP Conference Station and the network

a single RJ-45 connector for accessing the data network and connecting to the PIM, which provides power to the IP Conference Station

universal power supply for connection to a standard electrical power outlet in the wall

Understanding Interactions with Other Cisco IP Telephony Products

To function in the IP telephony network, the IP Conference Station must be connected to a networking device, such as a Cisco Catalyst switch, in order to obtain network connectivity. The IP Conference Station must also be registered with a Cisco CallManager system in order to make and receive calls.

Understanding How the IP Conference Station Interacts with Cisco CallManager

Cisco CallManager is an open and industry-standard call processing system. Cisco CallManager software runs on a Windows 2000 server and sets up and tears down calls between phones, integrating traditional PBX functionality with the corporate IP network. Cisco CallManager manages the components of the IP telephony system, the conference stations, the phones, access gateways, and the resources necessary for such features as call conferencing and route planning.

For information about configuring Cisco CallManager to work with the IP devices described in this chapter, refer to the Cisco CallManager Administration Guide and the Cisco CallManager System Guide.

Understanding the Startup Process

When connecting to the VoIP network, the IP Conference Station goes through a standard startup process.

Loading the Stored Station Image

The IP Conference Station has non-volatile Flash memory in which it stores firmware images and user-defined preferences. At startup, the IP Conference Station runs a bootstrap loader that loads a station image stored in Flash memory. Using this image, the station initializes its software and hardware.

Configuring VLAN

If the IP Conference Station is connected to a Cisco Catalyst switch, the switch next informs the conference station of the voice virtual local area network (VLAN) defined on the switch. The IP Conference Station needs to know its VLAN membership before it can proceed with the Dynamic Host Configuration Protocol (DHCP) request for an IP address.

Obtaining an IP Address

If the IP Conference Station is using DHCP to obtain an IP address, the station queries the DHCP server to obtain one.

Accessing TFTP Server

In addition to assigning an IP address, the DHCP server also directs the IP Conference Station to a TFTP Server. You must configure option 150 on the DHCP server for the TFTP information to be passed from the server to the client.

If the IP Conference Station has a statically-defined IP address, you must configure the alternate TFTP server locally on the IP Conference Station, and the IP Conference Station then goes to that alternate TFTP server directly.

Requesting the Configuration File

The TFTP server has configuration files (.cnf file format) for telephony devices, which define parameters for connecting to Cisco CallManager.

If you have enabled auto-registration in Cisco CallManager, the IP Conference Stations access a default configuration file (SEPdefault.cnf.xml) from the TFTP server. If you have manually entered the IP Conference Stations into the Cisco CallManager database, the station accesses an .xml file corresponding to its device name.

Contacting Cisco CallManager

The configuration file defines how the IP Conference Station communicates with Cisco CallManager. After obtaining the file from the TFTP server, the station next attempts to make a TCP connection to the highest priority Cisco CallManager on the list.

Understanding the Requirements for Installing and Setting Up the Cisco IP Conference Station 7935

To install and configure the IP Conference Station, you must configure some network setings, set up Cisco CallManager, and make changes locally on the IP Conference Station.

Refer to the following table for information on these procedures.

For More Information

Configure routers, gateways, and switches to handle voice communication

Sets up the IP telephony network.

See the documentation included with these devices.

Configure Cisco CallManager

Supports call processing and handling in the network.

See the Cisco CallManager documentation or online help in the Cisco CallManager application.

Decide whether to auto-register IP Conference Stations or add to the Cisco CallManager database manually

Determines how the IP Conference Station is added to the Cisco CallManager database and how a directory number is assigned.

See the "Preparing to Install" section.

See the Cisco CallManager documentation or online help in the Cisco CallManager application.

Connect the IP Conference Station to the network

Adds the IP Conference Station to the network.

See the "Installing and Connecting to the Network" section.

Configure locally defined network settings on the IP Conference Station

Sets IP settings if not using DHCP in the network and assigns a TFTP server.

See the ""Configuring Startup Network Settings" section and the "Accessing Network Configuration Settings" section.