LetNet AVVID Voice-Over-IP


Table of Contents



This preface covers these topics:

About this Guide

This guide is designed to help you perform basic and advanced phone tasks using your Cisco IP Phone Models 7960 and 7940. This guide assumes that your Cisco IP Phone is already connected and ready for you to use. For connection instructions, see the guide that shipped with your phone in the box: At a Glance Cisco IP Phone Models 7960 and 7940. Contact your system administrator for additional help.

If you use a Cisco IP Phone 7914 Expansion Module, refer to "Using the Cisco IP Phone 7914 Expansion Module" for an overview.

Related Documentation

For more information, refer to these documents:

Obtaining Documentation

The following sections provide sources for obtaining documentation from Cisco Systems.

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at the following sites:

Documentation CD-ROM

Cisco documentation and additional literature are available in a CD-ROM package. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.

Ordering Documentation

Cisco documentation is available in the following ways:



Documentation Feedback

If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.

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We appreciate your comments.

Obtaining Technical Assistance

Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools. For Cisco.com registered users, additional troubleshooting tools are available from the TAC website.


Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.

Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.

Customers and partners can self-register on Cisco.com to obtain additional personalized information and services. Registered users can order products, check on the status of an order, access technical support, and view benefits specific to their relationships with Cisco.

To access Cisco.com, go to the following website:


Technical Assistance Center

The Cisco TAC website is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract.

Contacting TAC by Using the Cisco TAC Website

If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC website:


P3 and P4 level problems are defined as follows:

In each of the above cases, use the Cisco TAC website to quickly find answers to your questions.

To register for Cisco.com, go to the following website:


If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following website:


Contacting TAC by Telephone

If you have a priority level 1 (P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, go to the following website:


P1 and P2 level problems are defined as follows:

Document Conventions

This document uses the following conventions:

Convention Description

boldface font

Commands and keywords are in boldface.

italic font

Arguments for which you supply values are in italics.

[   ]

Elements in square brackets are optional.

{ x | y | z }

Alternative keywords are grouped in braces and separated by vertical bars.

[ x | y | z ]

Optional alternative keywords are grouped in brackets and separated by vertical bars.


A nonquoted set of characters. Do not use quotation marks around the string or the string will include the quotation marks.

screen font

Terminal sessions and information the system displays are in screen font.

boldface screen font

Information you must enter is in boldface screen font.

italic screen font

Arguments for which you supply values are in italic screen font.


The symbol ^ represents the key labeled Control�for example, the key combination ^D in a screen display means hold down the Control key while you press the D key.

<   >

Nonprinting characters, such as passwords are in angle brackets.

Note   Means reader take note. Notes contain helpful suggestions or references to material not covered in the publication.

Caution   Means reader be careful. In this situation, you might do something that could result in equipment damage or loss of data.

Warnings use the following conventions:

Warning This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. (To see translations of the warnings that appear in this publication, refer to the appendix, "Translated Safety Warnings.")


Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van standaard maatregelen om ongelukken te voorkomen. (Voor vertalingen van de waarschuwingen die in deze publicatie verschijnen, kunt u het aanhangsel "Translated Safety Warnings" (Vertalingen van veiligheidsvoorschriften) raadplegen.)


T�m� varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan. Ennen kuin ty�skentelet mink��n laitteiston parissa, ota selv�� s�hk�kytkent�ihin liittyvist� vaaroista ja tavanomaisista onnettomuuksien ehk�isykeinoista. (T�ss� julkaisussa esiintyvien varoitusten k��nn�kset l�yd�t liitteest� "Translated Safety Warnings" (k��nnetyt turvallisuutta koskevat varoitukset).)


Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant entra�ner des blessures. Avant d'acc�der � cet �quipement, soyez conscient des dangers pos�s par les circuits �lectriques et familiarisez-vous avec les proc�dures courantes de pr�vention des accidents. Pour obtenir les traductions des mises en garde figurant dans cette publication, veuillez consulter l'annexe intitul�e � Translated Safety Warnings � (Traduction des avis de s�curit�).


Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer K�rperverletzung f�hren k�nnte. Bevor Sie mit der Arbeit an irgendeinem Ger�t beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur Vermeidung von Unf�llen bewu�t. (�bersetzungen der in dieser Ver�ffentlichung enthaltenen Warnhinweise finden Sie im Anhang mit dem Titel "Translated Safety Warnings" (�bersetzung der Warnhinweise).)


Questo simbolo di avvertenza indica un pericolo. Si � in una situazione che pu� causare infortuni. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di incidenti. La traduzione delle avvertenze riportate in questa pubblicazione si trova nell'appendice, "Translated Safety Warnings" (Traduzione delle avvertenze di sicurezza).


Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan f�re til personskade. F�r du utf�rer arbeid p� utstyr, m� du v�re oppmerksom p� de faremomentene som elektriske kretser inneb�rer, samt gj�re deg kjent med vanlig praksis n�r det gjelder � unng� ulykker. (Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen, kan du se i vedlegget "Translated Safety Warnings" [Oversatte sikkerhetsadvarsler].)


Este s�mbolo de aviso indica perigo. Encontra-se numa situa��o que lhe poder� causar danos fisicos. Antes de come�ar a trabalhar com qualquer equipamento, familiarize-se com os perigos relacionados com circuitos el�ctricos, e com quaisquer pr�ticas comuns que possam prevenir poss�veis acidentes. (Para ver as tradu��es dos avisos que constam desta publica��o, consulte o ap�ndice "Translated Safety Warnings" - "Tradu��es dos Avisos de Seguran�a").


Este s�mbolo de aviso significa peligro. Existe riesgo para su integridad f�sica. Antes de manipular cualquier equipo, considerar los riesgos que entra�a la corriente el�ctrica y familiarizarse con los procedimientos est�ndar de prevenci�n de accidentes. (Para ver traducciones de las advertencias que aparecen en esta publicaci�n, consultar el ap�ndice titulado "Translated Safety Warnings.")


Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till personskada. Innan du utf�r arbete p� n�gon utrustning m�ste du vara medveten om farorna med elkretsar och k�nna till vanligt f�rfarande f�r att f�rebygga skador. (Se f�rklaringar av de varningar som f�rekommer i denna publikation i appendix "Translated Safety Warnings" [�versatta s�kerhetsvarningar].)