 Can you use CAT 6a cable for telephone outlets? The majority of telephone systems are now operated on the VoIP transmission protocol. Current VoIP systems either run at 100 megabytes, or in some cases over a 1 gigabit transmission links. Therefore, currently, all structured cabling systems are suitable to run VoIP. However, if the overall design calls for an allowance for 10 gigabits to computers, servers, wifi, etc. The telephone points would use the same structured cabling as the other elements. Therefore, the entire office would be wired with CAT 6a cabling to achieve these requirements. Structured cabling design ensures that all technology can work over any of the cabling outlets. Therefore, the phones would operate over the same links as the computers and vice versa.