Strategies for Corporate VoIP Deployment

Strategies for Corporate VoIP Deployment

Onno W. Purbo

Savings pulling the phone is a big issue for most people, including the company. This paper will briefly discuss some strategies that need to be taken to implement VoIP in your company.

The main prerequisites that must be fulfilled before the implementation of VoIP can operate in the well, namely, (1) you have a connection to the Internet, and / or (2) has a direct connection to the VoIP provider / telecommunications operator directly. The first option to use the public Internet is usually done if you want to access the Internet simultaneously with VoIP. Meanwhile, two options to do if you want to do a lot of relationships with good communication with the VoIP telecommunications operator in Indonesia.

On the day the option is actually to begin his two-diffuse, it is important that we try to keep the bandwidth connection that we have sufficient for the phone conversation. VoIP, according to the theory that it can dispense with the voice bandwidth is very small and less than 6-7Kbps, but the resulting sound is usually not too good. In the field, we usually operate using VoIP G.729 compression, which will take the bandwidth around an 30-Kbps per call made. So if you use ADSL, which generally have the upstream 64Kbps you can only use it to call only about 2. By using ADSL we must be clever to set bandwidth and menshare with other Internet applications.

Indeed, some broadband VoIP providers that can be used for the call to PSTN or mobile, particularly overseas, such as VoIP Discount http://www.voipdiscount.com, but still limited and call you on 2 and call at once.

For those of you who want more serious to connect themselves to the PSTN network, the techniques that are linking themselves suggest solutions through corporate / business provided by telecommunications operators. The solution is usually given bandwidth wide enough and can enter directly to the central telephone service. One example telecommunications operator in Indonesia that I know to provide such service is XL.

Mendasarnya question, whether the preparation we need to do on the side of the customer? For those of you who want to accept it, of course, can only submit any type of installation in subkan to the operator. For those brave enough to lead atik technology, VoIP technology actually on this day is not too difficult to operated. We are in the field are provided in two (2) VoIP technology options, namely, technology-based H.323 and SIP-based technology. In the two-enough software is the central VoIP phone that can take in a free and open source on the Internet.

We are in the field this day prefer to use a SIP-based equipment because the days are increasingly using SIP and also the price of the equipment more affordable. Softswitch, which we normally use are usually use the asterisk in the capture of http://www.asterisk.org. Softswitch central fact in a phone that can operate in a normal computer. Meanwhile, the phone is the most simple form SoftPhone in the PC or PDA, which is good enough x-lite and SJPhone can take free on the Internet.

Most of the telephone exchange in the telecommunications operator based IP can usually speak in several types of protocols such as MGCP, SIP and H.323. Meanwhile, in the softswitch customers who are generally free to speak with SIP and H.323 protocol. On this day the SIP protocol to be more options in the main compare other protocol.

Not too difficult to install, such as softswitch asterisk in the computer and make customers who need telephone exchange is discussed in the interconnection to the central softswitch phone owned telecommunications operator. Information needed to be done is to interconnect the username, passsword and server / softswitch that the service side. By entering information to the authentication configuration softswitch asterisk, then we can easily register me-softswitch that we use to the central phone telecommunications operator.

With tersambungnya softswitch to the central phone operator telekomunkasi the speech or VoIP call can dilakuan from the internal corporate network to service the property. Depending on the agreement made, we actually can also receive a call from the network provider & PSTN to VoIP. To be able to receive a call directly from PSTN and mobile operators will then allocate a phone number in the know by Telkom, etc. for the VoIP connection that we use. Regulation in Indonesia that make this a risk.

In the customer is usually a corporate wish linking VoIP phone extension to the existing office. For linking to VoIP phones, we need a tool in the world on a regular SIP Analog Telephone Adaptar (ATA); while in the world usually in a H.323 Internet telephony Gateway (ITG). By using the ATA or ITG, we can linking VoIP to the existing PABX in the office that we use. Indeed, we may need to call PABX program to outside dilalukan to the ATA, and not to telcom normal channels.