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I am a Network Engineer with +5 years of experience. The goal of this wiki is to document things I do on my career from theory studying to labbing and also some off-topics. This wiki also serves as my personal knowledge base which can be accessed here. Phys...

The very first step to following the CCNA Voice Lab Manual is to have the main router with the correct IOS ready. This router should also have the proper CUCME support files. This lab walks through the configuration of the router with a certain IOS image and t...

TDM (Time-division Multiplexing): Method to create multiple digital channels by assigning time slots on the medium. Local loop: Connection to the subscriber from the central office (CO) switch. Key system: Small-scale telecommunications equipment, commonly...

Q&A 1. The audio streams between two IP Phones must go through the Call Agent (CUCME or CUCM Cluster) False. In a typical Cisco IP telephony deployment, the Call Agent (CUCME or CUCM) handles call signaling (setup, teardown, features, etc.), but once t...

In both CUCME and CUCM environments, phones need to connect to the network to receive services such as IP addresses from DHCP, VLAN assignments for voice traffic, IP information on where to register, and NTP packets. This lab focuses on establishing those serv...

Topology diagram for this lab Equipment Required Cisco 2821 router Cisco 3560 switch Objectives Configure NTP Scenario JRI wants its new data network to use NTP to synchronize time for network devices. NTP is not only important for synchronizing t...

The most important part of solving problems with VoIP solutions is knowing how a properly functioning system should work and comparing it to an existing problem. Cisco IP Phones have multiple steps to complete when connected to the network, and understanding t...

The following labs explore the three ways to administer CUCME. Equipment Required Cisco 2821 router Cisco 3560 switch PC with Cisco Configuration Professional (CCP) installed Objectives Determine the version of CUCME on the router. Connect to CUCM...

Equipment Required Cisco 2821 router with the GUI files loaded in flash (see Appendix D) Cisco 3560 switch PC Objectives Access the HTML GUI on the router. Scenario Jimenez Research Inc. (JRI) would like the office manager to add users and pho...

With previous labs building the foundation for telephony concepts and a network topology, it is time to turn our attention to configuring the Call Agent. In the following labs we will learn to configure Cisco Unified Communications Manager Express (CUCME) usin...

Scenario In this lab, JRI wants to establish internal calls using the new system with more than just the basics. Equipment Required Cisco 2821 router Cisco 3560 switch Lab configuration from Lab 4-2 Two or more IP Phones Objectives Configure te...

Scenario JRI would like the office manager to add users and phones without having to use the command line for configuration. Ideally, JRI wants to be able to access the configuration from any PC without installing client software. Topology used in this lab ...

Scenario JRI ran into problems, with some phones not registering, and wants to examine both the phone registration process and the protocols used for digital voice. Wireshark is well suited for this task. Equipment Required Cisco 2821 router Cisco 3560...

Labs in previous chapters established the ability to call between phones in your company. Now it is time to establish connections to allow phone calls to the public switched telephone network (PSTN) and branch offices. The main focus of this chapter is constru...

Topology diagram for this lab Scenario JRI expects to have enough incoming and outgoing calls that it want to use a digital connection to the PSTN. Not only do digital connections provide a trunk with 23 (PRI), 24 (T1), or 30 (E1) simultaneous calls on a s...

Introduction The PSTN Simulator is a Cisco router (a Cisco 2821 in this lab) with one or more T1/E1/PRI interfaces (and enough digital signal processor [DSP] resources to run the interfaces), configured to respond to incoming calls and to forward calls for ot...

Equipment Required No equipment is required for this lab. Learning Objectives Understand the concept of call legs. Understand POTS and VoIP dial peers. Create POTS and VoIP dial peers. Scenario This lab introduces the concepts of call legs, dial p...

Equipment Required No equipment is required for this lab. Learning Objectives Upon completion of this lab, you will be able to: Understand dial-peer selection. Understand POTS dial-peer digit-stripping behavior. Understand basic digit manipulation comm...

Topology diagram for this lab Scenario Jimenez Research Inc. (JRI) wants to connect to customers using the PSTN and remote branch offices of the company using the WAN. To avoid WAN failure from disabling four-digit dialing between locations, call failover ...