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ComTel is an international company,the headquarters is located in New York and there is an office in London. The international calls cost US$1000 every month.

ComTel built a VoIP solution with ChinaRoby IP phones and ChinaRoby Gateway ATAs to save expense.

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See also

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-Global System for Mobile Communications
-About VoIP
-SIP:Session Initiation Protocol
-List of commercial voice over IP network providers
-Mobile VoIP
-About GSM
-What is 3G ?
-List of SIP software
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