Cisco is a computer telephone that telemarketers and call centres use to call outbound.

This number rings my mobile phone, never leaves a message is ringing me at random times of the day and at night. When I ring back a message says its cisco's connecting unit and to leave your name and contact details...I have blocked it from my phone

Keeps ringing my phone number and hanging up. I think it a company or something called Cisco.

spam Number

keeps ringing then hanging up