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0002543: Call registrations fail with h.323 phone systems - MantisBT Endian Bugtracker
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IDProjectCategoryView StatusDate SubmittedLast Update
0002543Endian FirewallFirewall (iptables)public2009-12-15 11:052010-03-08 15:01
Assigned To 
PrioritynormalSeverityminorReproducibilityhave not tried
PlatformOSOS Version
Product Version2.2 
Target VersionfutureFixed in Version 
Summary0002543: Call registrations fail with h.323 phone systems
DescriptionWhen using certain VOIP h.323 phone systems, call registrations fail
during the h.245 negotiation stage.
This occurs both on connections from the Blue network and LAN to LAN VPN

The problem is quite bizarre, one or two packets are dropped but when
resent the packets pass through, the packets dropped (tcp) are mid
stream. Some PABX systems seem to either timeout (very quickly) or
ignore resent packets.

The solution is to remove the nf_nat_h323,nf_conntrack_h323 modules from
the kernel with modprobe -r at boot time.

This most likely will break h323 across the public internet, affecting
programs such as net meeting but atleast H323./H.245 VOIPS works
Attached Files

- Relationships
has duplicate 0002748closed Problems with VoIP and OpenVPN Gw2GW 

-  Notes
peter-endian (administrator)
2010-03-08 14:59

Workaround is in 0002748

- Issue History
Date Modified Username Field Change
2009-12-15 11:05 luca-endian New Issue
2009-12-15 11:06 luca-endian Tag Attached: purple
2010-03-08 14:55 peter-endian Status new => confirmed
2010-03-08 14:56 peter-endian Relationship added has duplicate 0002748
2010-03-08 14:59 peter-endian Note Added: 0003973
2010-03-08 15:01 peter-endian Target Version => future

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