在我的路由器（Fritzbox 7360）中，我安装了 openwrt，并且我想在低级别访问用于模拟电话的端口，因此我可以使用自定义脚本或软件通过它输出一些音频。
为了实现这一点，我列出了所有 /dev 设备：
drwxr-xr-x 3 root root 60 Jan 1 1970 bus
crw------- 1 root root 5, 1 Jan 1 1970 console
crw------- 1 root root 10, 62 Jan 1 1970 cpu_dma_latency
crw------- 1 root root 109, 0 Aug 5 19:36 dsl_cpe_api0
crw-rw-rw- 1 root root 1, 7 Jan 1 1970 full
crw------- 1 root root 254, 0 Jan 1 1970 gpiochip0
crw------- 1 root root 10, 63 Jan 1 1970 gptu
crw------- 1 root root 10, 183 Jan 1 1970 hwrng
crw------- 1 root root 1, 11 Jan 1 1970 kmsg
srw-rw-rw- 1 root root 0 Aug 5 19:36 log
drwxr-xr-x 2 root root 60 Aug 5 19:36 mei_cpe
crw------- 1 root root 90, 0 Jan 1 1970 mtd0
crw------- 1 root root 90, 1 Jan 1 1970 mtd0ro
crw------- 1 root root 90, 2 Jan 1 1970 mtd1
crw------- 1 root root 90, 3 Jan 1 1970 mtd1ro
crw------- 1 root root 90, 4 Jan 1 1970 mtd2
crw------- 1 root root 90, 5 Jan 1 1970 mtd2ro
crw------- 1 root root 90, 6 Jan 1 1970 mtd3
crw------- 1 root root 90, 7 Jan 1 1970 mtd3ro
crw------- 1 root root 90, 8 Jan 1 1970 mtd4
crw------- 1 root root 90, 9 Jan 1 1970 mtd4ro
crw------- 1 root root 90, 10 Jan 1 1970 mtd5
crw------- 1 root root 90, 11 Jan 1 1970 mtd5ro
crw------- 1 root root 90, 12 Jan 1 1970 mtd6
crw------- 1 root root 90, 13 Jan 1 1970 mtd6ro
brw------- 1 root root 31, 0 Jan 1 1970 mtdblock0
brw------- 1 root root 31, 1 Jan 1 1970 mtdblock1
brw------- 1 root root 31, 2 Jan 1 1970 mtdblock2
brw------- 1 root root 31, 3 Jan 1 1970 mtdblock3
brw------- 1 root root 31, 4 Jan 1 1970 mtdblock4
brw------- 1 root root 31, 5 Jan 1 1970 mtdblock5
brw------- 1 root root 31, 6 Jan 1 1970 mtdblock6
crw-rw-rw- 1 root root 1, 3 Jan 1 1970 null
crw------- 1 root root 1, 4 Jan 1 1970 port
crw------- 1 root root 108, 0 Aug 5 19:36 ppp
crw-rw-rw- 1 root root 5, 2 Aug 7 16:55 ptmx
drwxr-xr-x 2 root root 0 Jan 1 1970 pts
crw-rw-rw- 1 root root 1, 8 Jan 1 1970 random
lrwxrwxrwx 1 root root 8 Jan 1 1970 shm -> /tmp/shm
crw-rw-rw- 1 root root 5, 0 Jan 1 1970 tty
crw-rw---- 1 root dialout 251, 0 Jan 1 1970 ttyLTQ0
crw------- 1 root root 10, 61 Jan 1 1970 ubi_ctrl
crw-rw-rw- 1 root root 1, 9 Jan 1 1970 urandom
crw-rw-r-- 1 root root 122, 10 Aug 7 14:17 vmmc10
crw-rw-r-- 1 root root 122, 11 Aug 7 14:17 vmmc11
crw-rw-r-- 1 root root 122, 12 Aug 7 14:17 vmmc12
crw-rw-r-- 1 root root 122, 13 Aug 7 14:17 vmmc13
crw-rw-r-- 1 root root 122, 14 Aug 7 14:17 vmmc14
crw-rw-r-- 1 root root 122, 15 Aug 7 14:17 vmmc15
crw-rw-r-- 1 root root 122, 16 Aug 7 14:17 vmmc16
crw-rw-r-- 1 root root 122, 17 Aug 7 14:17 vmmc17
crw-rw-r-- 1 root root 122, 18 Aug 7 14:17 vmmc18
crw------- 1 root root 10, 130 Jan 1 1970 watchdog
crw------- 1 root root 253, 0 Jan 1 1970 watchdog0
crw-rw-rw- 1 root root 1, 5 Jan 1 1970 zero
但我不知道我的路由器的FON1端口是哪一个。你知道我如何检测它吗？