Dear Readers and Guru's, We are using a Cisco SX20 with ISDN Link due to some our regional offices still using ISDN connection, anyways, this is working fine. The only problem I am experiencing is the fact there are a lot of unknown established calls, examples below ; 1003, 3500, 100, 7070, 1003 and etc.. the format of the incoming call will start with an unknown number and followed by our SIP number ; 1003@***.**.*.***:5060 I want to permanently block this unknown callers as this is so annoying during our Video Conferencing meeting it keeps on ringing on the screen.. I was told that it has something to do with the network/firewall settings but honestly i don't know where to start. i had attached a screenshot of the unknown numbers we are receiving. TIA guys.
... View more