H - Electricity
04
Q
Inventor
Country: South Africa
Automatic disconnect in ringing state of call from user with...
Call management protocol for insufficient credit
Communication method and system
Services and transactions in a telephony network
Voiding calls to signal supplementary services
Automatic disconnect in ringing state of call from user with...
Call management protocol for insufficient credit
Services and transactions in a telephony network
Voiding calls to signal supplementary services
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