Cisco SX20 with ISDN Link : Receving calls from an unknown/strange numbers
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.
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