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Unread 03-30-2009, 07:37 PM   #31
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zonljmv,

Did you capture any SIP packets? I'd like to see the INVITE packets and also the SDP packets sent by your X-Lite and Ekiga.
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Unread 03-30-2009, 08:50 PM   #32
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Quote:
Originally Posted by boatman View Post
zonljmv,

Did you capture any SIP packets? I'd like to see the INVITE packets and also the SDP packets sent by your X-Lite and Ekiga.
Hi boatman,

Yes I made cap-files with tcpdump.
If you send me a Private Message with your emailaddress I will send the cap-files to that address.

Regards,
zonljmv
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Unread 03-31-2009, 09:59 AM   #33
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The INVITE packets that you noticed to sender (and recipient) are sent by Voxalot in an attempt to make a direct RTP connection between sender and recipient. I expect they would disappear if you set "Symmetric NAT Handling" yes.

As for the one way audio when using X-Lite, I don't see any evidence of it in the packet logs. RTP packets are going both directions, from sender to recipient and also the other way. Note that RTP packets from recipient to sender are routed through Voxalot, probably because the recipient doesn't obey INVITE once the RTP path has been established. The problem may be something to do with the X-Lite creating an RTP session description that includes your LAN address. You may be able to solve the audio problem by forwarding the RTP port range on the end that hears no audio, or go into your Voxalot account settings and set "Symmetric NAT Handling" to yes.
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Unread 03-31-2009, 11:31 AM   #34
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Hi boatman,

Because sender and recipient both have global IP-addresses the following should happen.
The INVITE request from Voxalot to the recipient should contain the IP-address and portnumber of the sender in the SDP-part.
The 200 OK status from Voxalot to the sender should contain the IP-address and portnumber of the recipient in the SDP-part.
So there should not be any NAT issue.

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zonljmv
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Unread 03-31-2009, 08:50 PM   #35
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Quote:
Originally Posted by zonljmv View Post
The INVITE request from Voxalot to the recipient should contain the IP-address and portnumber of the sender in the SDP-part.
With Voxalot the call is first established with RTP media streams through Voxalot, then if certain conditions are met INVITEs are sent to each end in an attempt to shorten the audio path. This is the first INVITE for the sender, but second INVITE for recipient.

In both samples you sent me, the recipient is not redirecting RTP to sender, the result is that the recipient's RTP stream continues to pass through Voxalot on it's way to the sender.

Quote:
Originally Posted by zonljmv View Post
The 200 OK status from Voxalot to the sender should contain the IP-address and portnumber of the recipient in the SDP-part. So there should not be any NAT issue.
Both samples contain RTP pacekets in both directions, and yet no sound is heard in one direction when using X-Lite. Is there a codec issue? I see "Media Attribute (a): rtpmap:0 PCMU/8000" in Session Description from ekiga, but not from X-Lite.
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Unread 03-31-2009, 10:21 PM   #36
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Hi boatman,

I've found the reason why X-Lite didn't function properly.
Because I make use of my own proxy server (siproxd) X-Lite should be set at "Use local IP address", but was mistakenly set at "Discover global address".
Thanks for your help and sorry for the inconvenience!

Regards,
zonljmv
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Unread 03-31-2009, 11:39 PM   #37
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Well, that's good news. Are RTP packets still going the same as before; one hop to recipient, and the return is two hops and through Voxalot?
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Unread 04-01-2009, 08:01 AM   #38
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Quote:
Originally Posted by boatman View Post
Well, that's good news. Are RTP packets still going the same as before; one hop to recipient, and the return is two hops and through Voxalot?
Yes, the same as before.

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zonljmv
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Unread 05-30-2009, 07:34 PM   #39
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Quote:
Originally Posted by martin View Post
us.voxalot.com load balances between 2 proxies. It is possible that one of these proxies had an RTP proxy problem (which would explain your 50% success/failure rate). As mentioned in another thread I have restarted all RTP proxies.

As such, could you please set your ATA back to us.voxalot.com and let me know if your problem still exists?

Thanks
Martin,

This problem is happening again.

Thanks,
The Doc
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Unread 06-01-2009, 09:49 AM   #40
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I have restarted all proxies. Please let me know if this addresses your problem?
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