VOIP Fundamentals

VOIP is the technology which allows voice calls to be transmitted over the IP network. It converts analog signals into digital data packets which can be transmitted over the IP network and wise versa. The simplest form of VoIP is a computer-to-computer voice connection. All you need is computer and a headset with a microphone.

There are many advantages and few disadvantages of VOIP.

Advantages

• Move, Adds and Changes – When you unplug and replug phones they will get updated no matter where they are. Phones are tracked in the system via it’s MAC address.
• Bandwidth & Equipment Efficiency – In PBX world every phone call takes 64kbps. In IP telephony voice can be compressed with a very little quality drop.
• Cost – Free long distance calls. WAN can be used to take free calls between offices.
• Services and Devices – Video calls, Wireless IP Mobiles

Disadvantages

• Although VoIP does provide plenty of advantages and features, there are a few disadvantages to this new technology that you should be aware of.
• Voice Quality – Audio quality is poor when you compare it with the PSNT (analog) call.
• Power – VOIP is depend on power. You need to plug your modem, router, ATA or other VoIP devices to the electric power supply for it to work A stable power source must be created for VoIP.

IP Telephony Migration

There are two types of IP telephony migration methods.

Method 1

Connect your existing PBX system to the router (Voice enabled router). Then the router will be able to convert voice into a packet (data) which can be transmitted over the WAN. With this method you can make calls to other branches without any additional cost.

Resetting the IP Phone to Factory Default

Following steps helps you to reset IP Phone to its Factory Default.

• Hold down the # key on the phone.
• Continue holding down the # key and re-apply power.
• While still holding the # key wait for the Message Waiting Indicator (MWI) light on the handset to start flashing.
• Once the MWI light is flashing, release the # key and enter the following sequence exactly on the keypad:3491672850*#

Once this sequence has been entered on the IP Phone, if all the network criteria above have been met, it should begin its recovery process. This process can take up to 15 minutes to finish. The phone may appear to be doing nothing during this time. Wait 10-15 minute until the power comes and then it will start to download the firmware from your TFTP server.