บันทึกปุ่มสายนอก​ เครื่องดิจิทัล​ Multiline​ Telephone​ NEC​ SL2100​ SL1000

https://www.youtube.com/watch?v=ZnVmTtSD5aU&feature=youtu.be
https://www.youtube.com/watch?v=ZnVmTtSD5aU&feature=youtu.be

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