Disadvantages of IP Telephony

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IP phone or IP telephony involves the employment of an existing, integrated Web network to interact between two or additional business or personal segments. The technology has replaced the previously explored PSTN or public switched phonephone network system. Calls created via IP telephony can traverse the established Web network. IP phone technology empowers call-making via proprietary protocols like Session Initiation Protocol and Client Management Protocol. The system might be fitted with software-primarily based Soft-phones or special built-in hardware-empowered devices. With the ability of integrated analog telephony adapters, even simple telephones will be reused as IP phones. The essential parts of an analog IP phone embody:

* A system that integrates the DNS, STUN and DHCP clients.
* Signaling and RTP Stack.
* Audio and video codecs.
* Special user interface.
* Dedicated hardware fitted with a microphone, earphones, keypad, display interface, voice engine, ADC and DAC converters, Ethernet and a battery or some DC source.

IP Telephony also works along systems fitted inside WiFi enabled mobile phones, PDAs and analog telephony adapters. Hardware empowered devices enable customers to use industrial VoIP or voice over Net protocol providers over existing PSTN telephony. Nowadays, the technology also accommodates designs that have built-in GSM base stations to gain access to remote areas where low-powered gateway transmitting otherwise becomes impossible. IP telephony flaunts modern features such as access to:

* Caller ID.
* ID Calling.
* Automatic use of network-primarily based directories.
* Conference calls.
* Decision transfer and hold.
* Storing user name/range in systems facilitated by different service providers.
* Weather report analysis.
* Live news.

Disadvantages of IP Telephony:

The IP telephony or call access via VoIP isn’t without its own set of disadvantages. These embrace:

* Limited or no use in the absence of an avid net access. The system will not accommodate calls beyond the Local area network or LAN, unless there is an integrated, compatible PBX system in place.
* Total dependency on separate electrical connectivity. Unlike the PSTN phones, IP Phones and routers connect solely via mains electricity. The system is not empowered to work via power generated from telephone exchanges.
* Easy congestion. These networks, notably residential web connectivity, easily succumb to congestion. The result’s poor voice quality or an entire decision-drop, in the midst of an emergency.
* Lapse in connectivity when exposed to high-latency connectivity. The technology does not empower internet-call connectivity when exposed to latency induced by protocol overhead. The system also fails to operate effectively when exposed to satellite web integration.
* Failure when integrated alongside alternative digital equipment. The IP telephony technology becomes redundant when other digital systems are integrated into the adopted phone line. Equipment like digital video recorders and residential security systems don’t integrate with VoIP.
* Difficult emergency calls. The technology becomes a challenge to surpass an emergency. VoIP uses special IP-addressed phone numbers and not regular public-service NANP phone numbers. Hence, it becomes difficult for a 911 operator to spot the exact geographic location of the given IP address.
* Distorted facilitation when challenged by latency and packet-loss. The Web association employed by the IP telephony technology makes the integrated system susceptible to broadband latency, jitter and packet-loss. The result’s distorted and garbled communication because of transmission error.
* Exposure to Denial of Service attacks (DoS attack). IP telephony, like different net integrated networks, is subjected to Denial of Service break-downs if the address used is an public IP id.

IP telephony is vulnerable to attacks from viruses and hacking. The system uses a technology that’s utterly hooked in to the facility of integrated PCs. The resultant processor drain ends up in frequent communication-quality loss and system-crash.

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