Secure SIP Directory VOIP System And Problem Solving

We are looking to setup as a trial a secure SIP lookup directory/exchange where clients upload VOIP numbers and their corresponding SIP address. Our directory should provision a dynamic SIP address for each number so that this is the published address for that number in our directory (we may not need this depending on architecture and security). When other clients do a lookup for these numbers or connect to our generated SIP addresses, we want to see if we can setup a system that can handle just the signalling and have the call between the source and destination connect directly. Instead of a lookup, we may only need to provide a SIP response of it does/doesn't exist and if it does, to then route the call. The main issue is that the end destination clients will only be opening access in their firewalls for our IP/systems to avoid issues with promoting a SIP address publicly. So the exchange acts as a way to approve trusted parties. Is there a way we can achieve this?

Please recommend, detail and cost your approach to setup this system using open source SIP and security software on amazon and to also support it on an ongoing basis (trial initially, so little to no traffic). We currently have an Asterisk installation on Amazon with someone who helps to support that, that we can use. We will also need an online web form connected to the database to register numbers.

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