I am experimenting with AstLinux 0.6.1 on a net5501 but the topology is different in the my pbx is on the NATed LAN with most (but not all) of the phones. I have not seen an issue with the net5501 failing to handle the RTP stream, my issue is that on ENUM calls Asterisk is attempting a "native bridge" with my NAT/firewall/router does not allow.

Anyway, are you using 0.6, 0.6.1 or the latest 0.6.2 release candidate which I think is labeled as astlinux-0.6-2082 on http://www.djhsolutions.com/astlinux/

Also, are you running "single homed" or do you have multiple interfaces online?

How is the firewall on your AstLinux box configured?

--Tod

On Nov 21, 2008, at 8:58 AM, Ron Byer Jr. wrote:

I’ve started using the astlinux 0.6 on a net5501 in earnest recently, and we have found ourselves in a world of hurt from a NAT perspective. We have a few phones behind their own soho firewalls, and the pbx is in the clear. 1-way audio, no-way audio for these NATted phones seems to be the deal. The SIP traffic works fine, even to the point of hangup. There just isn’t any media stream.



Until this is solved, I’ve set up another PC-based PBX, running asterisk on CentOS, just for the NATted phones It works fine. Same exact version of asterisk :: 1.4.21.2



I’ve been debugging this for the past week, and have followed the bread crumbs into the poll loop in ast_waitfor_nands. I can flip between the two installs (astlinux 0.6 and CentOS) and track the debug messages (including a ton of my own at this point) all the way to expecting the first RTP packet. Both installs track exactly. The CentOS side then starts picking up the rtp packets and bridging the streams. The Astlinux side hangs in the poll until the hangup. The poll wakes up on the SIP BYE message, which is very interesting. Tcpdump shows the rtp packets banging into the box from the phone and the ITSP, but the poll never wakes up until the hangup.



I came across some list mail from a few months box about one-way audio and NAT issues that would be solved(?) with an kernel update to .25 and a new uCLIBC. Not sure if that is wishful thinking or not. Also, my CentOS kernel version is 2.6.18, two points back from my astlinux 2.6.20.



Any thoughts/insight would be appreciated. I’m fresh out of ideas at present.





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