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Nearlly all companies are trying to deploy IP Telephony because of it's simplisty, amazing advantagies and it's consider to be an important part in smart building or smart home.
There many protocols in IP Telephony systems, SIP, Skinny.......
some system create there own protocal like cisco using only skinny (the new version 5 will support SIP)
Foundary support all protocol
Nortel, Avay and Simens is also good
To look deep in these companies (cisco, Foundary, Nortel, Avay and Simens), google them
IP Telephony is also illegal in Pakistan. But companies like Ufone, Mobilink are trying to implement IP Telephony in their back bone networks. But it has a huge market in Pakistan.
IMHO IP telephony will get going when Governments finally get out of the telephony market, all tho the largest Telecommunication provider in my country has been privatized the government still has over 30% shares and they get a lot of money, this is the case in most countries including some EU and all post socialist countries. And the big Mammoth companies can pay to keep VOIP out.
For most telcos VOIP is the killer service, a service that costs peanuts to setup and run, compared to the billions needed for the old PSTN\ISDN services.
I think emerging fields not for IP telephone only but other VoIP products also like ATA box and PSTN gateway and GSM gateway
because you can call any one using his country PSTN and the cost is very very cheep.
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