Method, system and gateway for seamlessly setting up call by using voice over internet protocol (VoIP) technique
A call establishment, seamless technology, applied in the direction of telephone communication, electrical components, interconnection devices, etc., can solve the problems of double dialing, inconsistent state of network elements, etc.
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[0035] refer to figure 1, the invention modifies the behavior of the access gateway so that it does not require the user to dial for the second time. Each external telephone line has a unique number, so this number can be set in the access gateway. When there is an incoming call from the telephone line, the modified access gateway will initiate a call according to the number preset in the gateway without waiting for the user to dial the second number.
[0036] Secondly, when A calls to B, according to the characteristics of the public telephone network, there will be a ringing current coming from the telephone line, which will be detected by the access gateway, and the modified gateway will not pick up the hook after detecting the ringing current. On the one hand, the gateway maintains the on-hook state, and on the other hand, based on the previous technology, it uses the built-in number of the access gateway to directly initiate a VoIP call. During this call waiting period,...
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