I'm researching a new solution for providing temporary comms at a remote site. The comms will be ISDN based until the primary comms link is in place. Due to the nature and location of the remote site ISDN calls will be very expensive.
My plan would be to use two Cisco routers with BRI interfaces to achieve the following:
1. Establish “Connectivity Windows” during which users will be aware that comms are up and be able to access remote data, applications, etc.
1a. The remote site will connect automatically at the beginning of a “Connectivity Window” and disconnect automatically at the end of the window.
1b. The line will disconnect automatically if idle for a certain amount of time but will reconnect upon seeing interesting traffic if during a “Connectivity Window”.
2. Calls should only be established from the remote site; however IT users should have the ability to establish a call from our central site if required.
3. If/when the primary comms are in place the ISDN connection should only be used as a backup if the primary comms were to fail.
I’ve used Cisco routers, but using ISDN lines is fairly new to me and certainly the implementation of the above is beyond my current knowledge.
I’m confident in configuring the ISDN interfaces and establishing a connection. What I’m hoping for is some pointers, comments, and feedback on how best to configure the connection to satisfy my requirements.