Can we used SGCP to control voice over packet, not just voice over IP?
Sure! In fact, there are already some studies on how to extend SGCP to control voice over ATM gateways. • How can we perform continuity tests? We have several provisions in SGCP for performing two kinds of continuity tests. This can be done either at the request of an adjacent switch, or at the initiative of teh call agent. As in ISUP, continuity test can be intertwined with the call set-up. • What if the signalling is not ISUP? The short answer is that you have to bring the signalling to the call agent, which has indeed to be programmed with adequate software. If the call agent understands, for example, Q.931, it can use SGCP to program the handling of trunks according to Q.931 signalling. The gateway does not even have to know that whether the signalling was Q.931 or ISUP. • A single call agent for an entire network? You must be kidding! Well, even in the most bell-shaped dreams, nobody really thinks that a single server can control the whole telephone network. The call agent can ind
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