[asterisk-users] Voice broken during calls (again...)

Marek Greško mgresko8 at gmail.com
Tue Jun 23 08:43:15 CDT 2020

2020-06-23 15:02 GMT+02:00, Luca Bertoncello <lucabert at lucabert.de>:
> Am 23.06.2020 14:49, schrieb Marek Greško:
> Hi Marek,
>> this could be ip address of the different interface on the same box. I
>> think it works like expected. The only exception would be if the sip
>> peer ignores the icmp packet unreachable. But I doubt this is the
> Do you mean "my Linux-Box ignores ICMP packet unreachable" or "Deutsche
> Telekom ignores them"?

I meant DT, but this was a speculation. I did not say they do. I
consider it highly improbable. Then I was asking whether you do. As
per configuration you sent you are not blocking icmp type 3 so this
should not be an issue.

>> case. Anyway you get problems also when calling to LTE phone without
>> using sip provider.
> I have problem calling someone outside my networks and I have problem if
> the peers are in different networks...
>> Let first concentrate on these calls LTE to LAN. Are you sure you do
>> not block incoming icmp unreachables? At least verify type 3 subtype 4
>> is enabled. If it is, I have no clue what is going on.
> Well, I limit incoming ICMP packets and I block some hosts (known
> crackers)...
> If you think, I can send you the script I use (with iptables) to manage
> my firewall, so you can check it...
> The only entries I have, having something to do with ICMP, are:
> ----------------------------------
> /bin/echo -n "Disable ICMP Redirect acceptance..."
> for f in /proc/sys/net/ipv4/conf/*/accept_redirects; do
>    /bin/echo 0 > $f
> done
> /bin/echo "done."
> /sbin/iptables -A INPUT -i dsl0 -p icmp --icmp-type echo-request -m
> limit --limit 6/m --limit-burst 5 -j ACCEPT
> /sbin/iptables -A FORWARD -o dsl0 -p icmp -j ACCEPT
> ----------------------------------
> and of course other rules to allow ICMP pakets in the internal
> networks...
> Thanks a lot
> Luca Bertoncello
> (lucabert at lucabert.de)
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