Voice over IP (VoIP) is a technology that allows you to transmit voice over an IP network. This enables both telephony and data to be transmitted over the same network packet-based infrastructure. There are two fundamental protocols used to transmit the signaling that is necessary to make IP telephony operate correctly. These protocols are Session […]
How to Use Cisco ECC Profile to Provide Caller ID Details for External Calls
One of the most asked questions from those who deployed Cisco Unified Communications Manager is how to provide external caller ID on IP phone display. CUCM does it well for internal phone lines, but what about external incoming calls? Your account managers would love seeing the name of the client calling on the IP phone. […]
IP Telephony and VoIP Tutorial
Although this is a Cisco networks dedicated blog, I decided to start a series of tutorial posts about a general technology which is not directly related to Cisco but it is a field in which Cisco is again a major player. This is IP Telephony and Voice over IP (VoIP). Image Source The two terms, […]
Cisco UC560 Dial Plan for Voice Mail Configuration Example
While working with a Cisco UC560 setting up CME (Call Manager Express) and CUE (Cisco Unity Express) I came across an issue. I had setup and registered my phones and extensions and all was well. I was able to make calls to and from internal phones. While working to setup CUE and my first mailbox […]
How does VoIP work-Brief Overview
Just as in classical telephony, the voice signal is sent to the phone microphone handset in the form of an analog signal. An analog to digital converter transforms this signal into a digital one which is then encoded according to an audio format. There are different encoders for compression of a conversation with varying degrees […]
Connecting two Cisco Unified Communication Manager Express with H323
The Cisco Unified Communications Manager Express (CUCME) is the new brand name given by Cisco to the older Call Manager Express (CME) system. The concept is the same however: IP Telephony software running on Cisco routers. Therefore, the CUCME is a normal Cisco router (models supported are 1800, 2800, 2900, 3800, 3900 series) with a […]
IP Telephony and VoIP Tutorial-Part 3
Continuing our series of posts on IP Telephony and VoIP, here is Part 3 of the tutorial: Is IP Telephony Implemented Easily ? Over time, most companies have acquired the expertise to implement IP Telephony solutions, either on existing corporate networks or from scratch. The main advantage to implementing VoIP applications is that they rely […]
IP Telephony and VoIP Tutorial-Part 2
Continuing our series of posts on IP Telephony and VoIP, here is Part 2 of the tutorial: Can an IP Telephony System be connected to the public telephone network There are special voice gateways which can connect an IP Telephony system with the public switched telephone network (PSTN) or other telephone networks. Using the voice […]
Cisco Unified Communications Manager Express – Deployment and Operational Models
The Cisco CallManager Express is a product under the Unified Communications Products suite of Cisco. In the past it was known as CCME (Cisco Call Manager Express) but now the new name is Cisco Unified Communications Manager Express. This product is an IP Telephony system (IP PBX) for small to medium size businesses of up […]
Basic IP Phone Configuration on Cisco Call Manager Express
Before showing you how to configure a basic IP phone on Cisco CallManager Express (CCME), you need first to understand the concepts of ephone and ephone-dn. In CCME, “ephone” (short for Ethernet Phone) refers to the physical IP phone device, and is configured with the Ethernet MAC address of the IP phone. The MAC address […]
SIP Trunking With Call Manager Express
For many years now, telephony voice services for businesses and enterprises have been provided by using legacy PBX systems connected to the Public Switched Telephone Network (PSTN) using TDM connections (T1/E1 ISDN PRI lines or BRI or analog lines). This is shown on the figure below: Newer telephony systems adopted the IP technology on the […]
Call Manager Express CME Deployment Scenarios
The Cisco Unified CallManager Express (CME) solution not only has the benefit of voice-data integration on a single platform, but offers also flexible deployment options. The Cisco CME on its basic form consists of a router on which the callmanager software is installed, plus several telephony devices. The CME router acts as a gateway between […]
How To Download and Install Cisco Call Manager Express CME Software
The Cisco Call Manager Express (CME) software (its new name is Cisco Unified Communications Manager Express) provides IP Telephony services that run on Cisco Integrated Services routers (such as 1800, 2800, 3800 family series). I will start a series of posts in this blog about IP Telephony, starting today with the installation of CME on […]