Long Distance Phone Bill Tax Refund

If you live in the US then you can qualify for a special one time tax refund of approximately $30 to $60. The estimated total amount to be refunded is reported at around $10 billion.

According to the Internal Revenue Service "The telephone tax refund is a one-time payment available on your 2006 federal income tax return, designed to refund previously collected federal excise taxes on long-distance or bundled services. It is available to anyone who paid such taxes on landline, wireless, or Voice over Internet Protocol (VoIP) service."

What Are Protocols In VoIP Telephony

VoIP protocols are the technical codings that enable voice to be carried over the internet. There are several competing standards in that field. Here you have a brief summary of these.

Perhaps the most famous VoIP protocol is the H.323 standardized by International Telecommunication Union (ITU). H.323 is very sophisticated partially due to the fact that it is not just a strict VoIP protocol but also one for interactive data sharing, videoconferencing and audio/video processing. It is actually a conglomeration of several smaller protocols, namely:

• Transport protocols H.225, H.235,H.245,H.450.1,H.450.2,H450.3,RTP,X.224.0
• Data protocols T.122,T124,T125,T126,T127
• Audio protocols G.711,G.722,G.723.1,G.728,G.729
• Video protocols H.261,H263
• Fax protocol T.38

Another smaller but very robust protocol is more geared to just VoIP. It is called Session Initiation Protocol and usually referred to as simply SIP. It consists of MIME, SDP and SIP itself.

MGCP (Media Gateway Control Protocol supported by Level 3, Bellcore, Cisco and Nortel) has also gained a substantial share of the VoIP market. Other main VoIP related protocols include Megaco H.248 (Media Gateway Control boasting great interoperability and backed by GTE, ICG, Netcom, Level 3,Sprint and founded by joint cooperation of IETF and the ITU-T Study Group 16), RVP over IP, SAPv2, SGCP and Skinny.

All these protocols are not always 100% compatible with each other therefore some possible standardization might by showing up there in the future.

And important factor in protocols application is bandwidth optimization. Signaling proxy operations are normally faster then the full proxy modes but perhaps the fastest are approaches like those of TDMoIP which deal with bundling together conversations going in the same direction.

http://voipchoice.blogspot.com/