When the distant end answers, the terminating side signals answer supervision towards the originating side by going off-hook. Both ends remain off-hook for the duration of the call. Either end can disconnect the call by going on-hook. For PBX and CO products, the DTMF receivers are a shared resource and there may be less of them than there are total lines and trunks. Another reason is the glare reduction.
Glare occurs when both ends of the trunk attempt to seize the trunk at the same time.
See sample output below for more information on how to verify and modify the wink delay parameters. 300 ms Delay Duration Timing is set to 2000 ms Dial Pulse Min. The default is 200 ms. The default is 200 ms. This is the most basic protocol.