I have a rule in iptables to drop certain packets from addresses, like:
iptables --list | grep 37 DROP all -- 37.0.0.0/8 anywhere
So I am wondering how this got through???
[Jan 27 02:36:52] NOTICE[9298][C-000005ce] chan_sip.c: Call from '' ( 37.8.28.217:10024) to extension '888888011972592871997' rejected because extension not found in context 'default'
Shouldn't the firewall have dropped it?
Without more info, no one can help. Iptables are processed top down, have you allowed something less specific above? A subnet, a protocol etc?