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[Users] Mediaproxy with t38

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Pavel D. Kuzin

7 Aug 2006 7 Aug '06

6:37 a.m.

Hello! Somebody using mediaproxy with t38? Can you provide me some configuration examples? Thank you. -- Pavel D.Kuzin System Administrator Nodex ISP St. Petersburg, Russia pk(a)nodex.ru http://nodex.ru

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Daniel-Constantin Mierla

7 Aug 7 Aug

4:07 p.m.

Hello, you should not do anything special for t38, from proxy's point of view, does not matter the content of media stream. For the fax relaying, you should make sure that you handle re-INVITEs properly. Cheers, Daniel On 08/07/06 13:37, Pavel D. Kuzin wrote:

Hello! Somebody using mediaproxy with t38? Can you provide me some configuration examples? Thank you. -- Pavel D.Kuzin System Administrator Nodex ISP St. Petersburg, Russia pk(a)nodex.ru http://nodex.ru _______________________________________________ Users mailing list Users(a)openser.org http://openser.org/cgi-bin/mailman/listinfo/users

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Pavel D. Kuzin

8 Aug 8 Aug

3:52 a.m.

can you show example configuration of properly reINVITE handling? -- Pavel D.Kuzin System Administrator Nodex ISP St. Petersburg, Russia pk(a)nodex.ru http://nodex.ru ----- Original Message ----- From: "Daniel-Constantin Mierla" <daniel(a)voice-system.ro> To: "Pavel D. Kuzin" <pk(a)nodex.ru> Cc: <users(a)openser.org> Sent: Tuesday, August 08, 2006 12:07 AM Subject: Re: [Users] Mediaproxy with t38

Hello, you should not do anything special for t38, from proxy's point of view, does not matter the content of media stream. For the fax relaying, you should make sure that you handle re-INVITEs properly. Cheers, Daniel On 08/07/06 13:37, Pavel D. Kuzin wrote:

Hello! Somebody using mediaproxy with t38? Can you provide me some configuration examples? Thank you. -- Pavel D.Kuzin System Administrator Nodex ISP St. Petersburg, Russia pk(a)nodex.ru http://nodex.ru _______________________________________________ Users mailing list Users(a)openser.org http://openser.org/cgi-bin/mailman/listinfo/users

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Kristian Kielhofner

10:47 a.m.

Daniel-Constantin Mierla wrote:

Hello, you should not do anything special for t38, from proxy's point of view, does not matter the content of media stream. For the fax relaying, you should make sure that you handle re-INVITEs properly. Cheers, Daniel

Daniel, I'm having the same problems with T38, between a Sipura 2100 and Cisco AS5350XM. Everything works quite well unless there is NAT. When the Sipura is behind NAT I can make voice calls but T38 faxing fails. Isn't a Re-Invite just an INVITE within an existing SIP session? What special configuration/processing does it require? I'm really curious about this... Thanks! -- Kristian Kielhofner

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Nathan Hawkins

10:53 a.m.

I believe T.38 uses UDPTL instead of RTP. So you'd need support for it in mediaproxy for it to work. Kristian Kielhofner wrote:

Daniel-Constantin Mierla wrote:

Hello, you should not do anything special for t38, from proxy's point of view, does not matter the content of media stream. For the fax relaying, you should make sure that you handle re-INVITEs properly. Cheers, Daniel

Daniel, I'm having the same problems with T38, between a Sipura 2100 and Cisco AS5350XM. Everything works quite well unless there is NAT. When the Sipura is behind NAT I can make voice calls but T38 faxing fails. Isn't a Re-Invite just an INVITE within an existing SIP session? What special configuration/processing does it require? I'm really curious about this... Thanks! -- Kristian Kielhofner _______________________________________________ Users mailing list Users(a)openser.org http://openser.org/cgi-bin/mailman/listinfo/users

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Kristian Kielhofner

10:59 a.m.

Nathan Hawkins wrote:

I believe T.38 uses UDPTL instead of RTP. So you'd need support for it in mediaproxy for it to work.

Nathan, I use rtpproxy, it seems that it supports relaying UDPTL: http://lists.iptel.org/pipermail/serdev/2005-July/005260.html -- Kristian Kielhofner

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Andreas Granig

11:04 a.m.

Nathan Hawkins wrote:

I believe T.38 uses UDPTL instead of RTP. So you'd need support for it in mediaproxy for it to work.

Mediaproxy doesn't care about the content of the media streams. AFAIR, the real problem with T.38 and NAT between two endpoints A and B is that B waits for T.38 packets from A before replying, but mediaproxy needs at least one packet from each A and B to be able to bridge together the streams (otherwise it doesn't know to which NAT ports the streams have to be redirected). Just my 2 cents, Andy

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Pavel D. Kuzin

4 Sep 4 Sep

9:30 a.m.

Have any workaround or fix of this problem? -- Pavel D.Kuzin System Administrator Nodex ISP St. Petersburg, Russia pk(a)nodex.ru http://nodex.ru ----- Original Message ----- From: "Andreas Granig" <andreas.granig(a)inode.info> To: "Nathan Hawkins" <utsl(a)quic.net> Cc: <users(a)openser.org> Sent: Tuesday, August 08, 2006 7:04 PM Subject: Re: [Users] Mediaproxy with t38

Nathan Hawkins wrote:

I believe T.38 uses UDPTL instead of RTP. So you'd need support for it in mediaproxy for it to work.

Mediaproxy doesn't care about the content of the media streams. AFAIR, the real problem with T.38 and NAT between two endpoints A and B is that B waits for T.38 packets from A before replying, but mediaproxy needs at least one packet from each A and B to be able to bridge together the streams (otherwise it doesn't know to which NAT ports the streams have to be redirected). Just my 2 cents, Andy _______________________________________________ Users mailing list Users(a)openser.org http://openser.org/cgi-bin/mailman/listinfo/users

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participants (5)

Andreas Granig
Daniel-Constantin Mierla
Kristian Kielhofner
Nathan Hawkins
Pavel D. Kuzin