Voice over IP
What are PRI Cards & Analog Interface Cards – Connectivity & Architecture Diagram
While there are lot of advantages of moving to VOIP/ IP Telephony Systems, there are invariably some analog connections that are required to be interfaced to the IP world. One might want to connect their PRI Lines, Analog Trunk Lines, Analog Phones (Extensions), Fax machines, etc to their IP PBX/ IP Telephony Systems. In... »
Telephone Trunk Lines: What is a SIP Trunk?
Like how you can use an IP Phone/ ATA to make inexpensive long distance calls from your home using a VOIP Service, SIP Trunks enable the users in an organization to do the same! To use a SIP Trunk, you need an Internet Connection, an IP PBX/ Analog-Mixed PBX, IP Phones / Analog Phones,... »
IP PBX vs Traditional PBX : Advantages of IP PBX over Analog/Digital PBX
Why is the Telephony industry moving over to VOIP / IP Telephony so fast, in-spite of the high reliability of Analog/ Digital PBX, and the high costs of IP Phones? Lets find out the advantages of IP PBX over Analog-Digital PBX, in this article. »
Receive your PBX land line calls through SIP clients on Wi-Fi enabled Cell phones
There are many advantages of moving over to VOIP / IP Telephony. One of them, is the ability to receive your land line calls (Corporate PBX extension number) on your cell phones (smart phones) through the Wireless (Wi-Fi) Network. A software called SIP Client (If your IP PBX supports SIP) needs to be installed... »
CENTREX and Hosted IP PBX
This article analyses two methods of Pay-As-You-Go Remote PBX Solutions that provide telephony services to companies - both on the analog network and on the IP Network (LAN/ Internet) - CENTREX Vs Hosted IP PBX. We will analyze the advantages and limitations of both of them. »
IP Phones – Advantages & Disadvantages (In comparison with Analog/Digital Phones)
This article throws some light on IP Phones (vs) Analog/ Digital phones. We will look at the differences between both by analyzing the advantages and disadvantages of either in each point that follows, without getting much in to the functionalities offered by the IP PBX (vs) Analog-Digital Mixed PBX. Cost: The higher cost of... »
VOIP Softphones might be a better option than IP Hardphones for some applications
There are quite a number of freely down-loadable (as well as paid for) SIP based VOIP Soft-phones that are available, which can be downloaded to your Computer/ Laptop and used with a headset/ in-built speaker-mic. When combined with a SIP based enterprise IP Telephony server, these soft-phones become your phone extensions and you can... »
Licenced & Open Source Voice Codecs in IP Telephony (VOIP) – A brief Introduction
In this article, we will see why its important to select the right voice codec for IP Telephony (VOIP) implementations and a short introduction to some of the popular voice codec's - G.711, G.729, G,723.1, iLBC, Speex & GSM codec. These are all narrow band codec's. »
Can Open Source PBX be scaled to carrier grade?
As we know, open source PBX (Soft Switch) has already been accepted as a stable and preferred voice switch for enterprises and business establishments. In this article, we will see if the open source PBX meant for enterprises can be scaled to carrier grade - to handle protocols like SS7 after analysing the current... »
Factors that affect VOIP Call quality
In this article, we would take a look at the various factors that affect the call quality while transporting voice over IP Networks. We take a look at factors like the type of audiocodec used, latency, jitter and jitter buffer, packet loss, packet size, silence suppression, echo and other network parameters that affect the... »
