Help avoiding SIP scanner calls

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giqcass:
Before you make the changes the Obi will accept traffic from
anyusername@Your.ip.Adress:5060-5063

After the change it will only accept calls from user names that you defined in the inbound route. Like:
0755999999@Your.ip.Adress:5060

Since most people know sip usually use port 5060-5070 and they know some common extension like 101 and 1001 they simply send random request to IP addresses in the format
1001@random.ip.Adress:5060

They vary the ports from 5060-5070 and try different user names but chances are they will never guess your real user name and therefore never ring your phone after you make the change.

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