[asterisk-users] Is 100 trying mandatory? Can asterisk answer with 180 without prior 100 trying?
benoit.panizzon at imp.ch
Tue Mar 20 07:25:36 CDT 2018
> A (very) dirty workaround would be to drop these packets with iptables
> (assuming Linux as OS), something like:
> iptables -t raw -I OUTPUT -p udp -d ipaddrofpbx -m string --algo bm
> --from 0 --to 32 --string "SIP/2.0 100 " -j DROP
> Don't try it with TCP :)
Indeed, this is what I did with a Mikrotik Firewall that is in front
of the * Server: Drop UDP packet with content starting with "SIP/2.0
And this showed, that not the missing 100 Trying is tripping our SBC.
So I contacted the Vendor who had a quick look at the 181 Ringing which
is not being relayed and found that the issue was the Contact: Header
containing two line= attributes.
So I'm now trying to contact the vendor of that other PBX to figure
out, why it is sending two line= attributes as part of the contact
Mit freundlichen Grüssen
I m p r o W a r e A G - Leiter Commerce Kunden
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
More information about the asterisk-users