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I replaced an IVR machine for incoming call after going down. It is running asterisk 1.4.23 on ubunutu 10.04 I decided to put the server behind iptables because my server was under brute force attack.

Our customer are experiencing busy signal when dialing our numbers, I checked the logs and I saw various warnings. Here are some issues I noticed in the logs:

[Jan 24 05:02:00] WARNING[939] chan_sip.c: Maximum retries exceeded on transmission 245102dwdw45f4f51f5df5s3@xx.xx.xx.xxx for seqno 102 (Critical Response) -- See doc/sip-retransmit.txt.
[Jan 24 05:02:00] WARNING[939] chan_sip.c: Hanging up call 245102dwdw45f4f51f5df5s3@xx.xx.xx.xxx - no reply to our critical packet (see doc/sip-retransmit.txt).
[Jan 24 06:29:37] WARNING[939] chan_sip.c: Got 200 OK on REGISTER, but there isn't a registry entry for 'mpdhbf867' (we probably already got the OK)
[Jan 24 06:34:07] WARNING[939] chan_sip.c: Got 200 OK on REGISTER, but there isn't a registry entry for 'mpdhbf867' (we probably already got the OK)
[Jan 24 17:00:32] NOTICE[939] chan_sip.c:    -- Registration for 'mpdhbf867@provider-domain.com' timed out, trying again (Attempt #1)

When I turn off my iptables, everything goes back to normal , and the phone call never drops or ring busy. It's a hard trade off because I do not want to leave my server open to the public internet .

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closed as too localized by Gilles, derobert, ire_and_curses, uther, jasonwryan Jan 25 '13 at 0:07

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Please do not post the same question on multiple Stack Exchange sites. I'm voting to close this copy since the Server Fault version has been answered. –  Gilles Jan 24 '13 at 23:04
[Translation: i need help my company will be going to be bankrupt i would delete them later if you want] Ce ne sont pas nos affaires, et ce n'est pas une excuse pour nous faire résoudre ton problème trois fois. [That's none of our business, and it's no excuse to make us solve your problem three times.] –  Gilles Jan 24 '13 at 23:44

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