Two players support GSM support for Blackberry and iphone gadgets. They are Bharti Airtel and Vodafone. The new players in this GSM arena are again Reliance and Tata. Presently, the state owned BSNL only offers 3G mobile services. So, Push e-mails, live video streaming, video calls in black berry and iphone devices are yet to be launched by other operators.

MTN a russian based operator in new to Indian scenario. BSNL, Airtel, Aircel, Vodafone, iDea, are the main GSM operators. Popular mobile brands in India are Nokia and Sony Ericsson. The new features included in today’s handsets are accelerometer, motion gaming, shake control, touch flow interface, touch instruments like guitar, drums and piano, stereo and mobile dolby sound.

Currently, the pixel war is going on between sony ericsson and samsung; both vying for the mega pixel honor. Samsung has recently launched its marine brands of handsets useful in water sports and extreme game environment.

Present phones come with GPS features. It is certainly a boon. The camera includes Geo-tagging feature to identify the time and place and facilities to directly transfer photos and videos to your blog or the web; either through GPRS or wi-fi.

DMA, a competing cell phone service technology, competed with GSM. GSM (stands for Global System Mobile) uses SIM Cards, a small chip that goes in and out of the phone usually behind the battery area, and is widely used worldwide.

CDMA uses a “spread-spectrum” technique. This technology separates data and voice packets using codes, it then transmits that data and voice using a wide frequency range. By allocating more space for data, CDMA is an excellent technology for 3G. 3G is a high speed Internet connection for mobile phones.

The CDMA standard is primarily used in the United States as well as some parts of Asia, as opposed to GSM which is used worldwide. Currently both Verizon and Sprint use CDMA technology and T-Mobile as well as AT&T use GSM technology.

Voip Hardware can be classified in three general categories:

-gateways and routers
-end stations (such as phones)
-controllers

Like everything else in the IT domain, every category has a specific function that it performs. And if you combine all the functions you will get a complete VoIP system.

VoIP Routers
Routers are (voip) devices that decide where the IP datagrams should go, between networks, from the source to the destination. Routers are inter-network equipments that help a LAN connect to a WAN; therefore the router’s capability to ensure correctly handled high-priority traffic is very important. Since WAN speeds have generally less bandwidth than a LAN, proper packet queuing and priorization is in order to ensure good voice quality across the path.

VoIP controllers
VoIP controllers, also called IP PBXs, manage the VoIP network. IP PBX controllers are PC-based, running a standard OS (such as Microsoft Windows, Linux or Sun Solaris, but very different) with additional software to control the VoIP systems. Plus they are performing all the functions of a traditional PBX. These systems can provide APIs to extend vendor-provided or user-written features and functionality.

Hardware and software vop phones
There are two types of vop phones: hardware and software.

A hardware phone is a physical device, very similar to your common phone; it has a handset, dialpad, etc. The only thing that is different from your ordinary phone is that it connects to an Ethernet network rather than a telephone network. vop phones are built with all the necessary hardware (and software) to digitize your voice (i.e., codecs) as well as setup and make calls (i.e., signaling and transport). – Software-only phones, or “soft” phones, use the PC’s capabilities to communicate with other PC’s over the Internet, by using the PC’s sound card, CPU and network card as part of the phone’s hardware, and thus, enable a PC to become an IP phone.

VoIP gateway
With so many options available today, gateways are also capable of transcoding (changing the signal from one codec version to another so that the voip device can communicate with the rest of the network). A VoIP gateway is a voip device that connects the VoIP network to your public telephone network (PSTN). For example, a gateway uses G.729 codec, while your PTSN network uses a G.711 codec.

Jim Francisto
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