With your equipment you need to have a SINGLE connection of all incoming cables with a large copper wire ( or better a broad copper strap) to a good local ground rod or better a ground mat, with low resistance. The single point has incoming mains, incoming phone, incoming cable and terrestrial and satellite TV all coming to a common copper bar with a good connection to the shields of the cables and a good short connection between the MOV and spark gap units used on the individual lines. Then you have the server rack or your office computers connected only to that point.
This does help, though for a direct strike all bets are off. You will also need a incoming distribution board lightning arrestor at the service input, and another at the distribution board, both to a local ground mesh, which can, if they are within a 3m range of each other, be bonded together or even be the same one. Preferably have the phone and cable come in at the same point with the shield of the cable or the common mode spark gaps connected to this as a first line of defence.
I lived in a small town, where one fine day there was a storm 40km away in the mountains. Lightning struck the overhead lines leading out to serve all the farms, and, aside from blowing sections of the 40km of wiring to vapour, it went into the digital exchange, even through the incoming telecom grade surge arrestor cascade. Blew up every electronic part inside the exchange, and the arcing inside the card cages welded them to the racks as well. The only thing that survived was the 48V local battery, a 250Ah lead acid wet cell bank. The exchange had to be cut apart with grinders to get it out, and it took 3 weeks for the phones to work again.
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