Re: [asterisk-users] IAX for internet file transfer?
On 27 Jun 2009, at 11:27, Maris wrote: guarantee delivery?, not to mention that IAX2 does not use RTP. Are you suggesting to change the protocol to support such transfers? When it makes sense, yes - see below, otherwise the idea can get into the waste paper backet. ... But why does he want to do it ? Share secret / illegal files LOL ? Transfer files and/or logging data to/from computers anywhere in the intranet of organizations - over the internet. Due to restrictions this computer may not have server functionality. For the purpose, an IAX client can be installed on the remote computer. Of course, such client-client communication can be solved using an intermediate server which two clients that exchange data connects to. The specific features of IAX (NAT transparency) could help, provided that simple TCP channels initiated by the clients can posess problems in establishing connections under certain weird network constellations - it goes beyond my knowledge to judge that. ... to the other side and decode it there Asterisk (or just about any VoIP software) will opt for timely delivery rather than a reliable delivery. Encoding digital data into audio in order to transfer it as digital audio data packets makes no sense for me. Packet problems can be overcome with other methods, as pointed out by other contributors. Rob Maris Hardware developer You should read the protocol spec. http://www.rfc-editor.org/authors/rfc5456.txt It already supports a couple of 'data' transports, including the one that was used to upgrade the IAXy firmware. I don't think you would have to change much (if anything) in the protocol to make it work. Tim. Tim Panton - Web/VoIP consultant and implementor www.westhawk.co.uk smime.p7s Description: S/MIME cryptographic signature ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] IAX for internet file transfer?
> guarantee delivery?, not to mention that IAX2 does not use RTP. Are you > suggesting to change the protocol to support such transfers? When it makes sense, yes - see below, otherwise the idea can get into the waste paper backet. ... > But why does he want to do it ? Share secret / illegal files LOL ? > Transfer files and/or logging data to/from computers anywhere in the intranet of organizations - over the internet. Due to restrictions this computer may not have server functionality. For the purpose, an IAX client can be installed on the remote computer. Of course, such client-client communication can be solved using an intermediate server which two clients that exchange data connects to. The specific features of IAX (NAT transparency) could help, provided that simple TCP channels initiated by the clients can posess problems in establishing connections under certain weird network constellations - it goes beyond my knowledge to judge that. ... > to the other side and decode it there Asterisk (or just about any VoIP > software) will opt for timely delivery rather than a reliable delivery. Encoding digital data into audio in order to transfer it as digital audio data packets makes no sense for me. Packet problems can be overcome with other methods, as pointed out by other contributors. Rob Maris Hardware developer ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] IAX for internet file transfer?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, Tzafrir Cohen a écrit : | On Fri, Jun 26, 2009 at 07:50:08PM -0500, Moises Silva wrote: |> On Fri, Jun 26, 2009 at 6:48 PM, Maris wrote: |> |>> I'm dealing with an idea to exchange data in a socket connection style |>> or a sort of ftp transfer with IAX2 as the transport medium. | | So while you can basically encode your data into an audio file, send it | to the other side and decode it there Asterisk (or just about any VoIP | software) will opt for timely delivery rather than a reliable delivery. | IAX does support sending / receiving images, and so does asterisk, so I guess it could support any file. tiare*CLI> ~ -= Info about application 'SendImage' =- [Synopsis] Send an image file [Description] ~ SendImage(filename): Sends an image on a channel. Thanks, - -- Jean-Denis Girard SysNux Systèmes Linux en Polynésie française http://www.sysnux.pf/ Tél: +689 50 10 40 / GSM: +689 79 75 27 -BEGIN PGP SIGNATURE- iEYEARECAAYFAkpFiL4ACgkQuu7Rv+oOo/gjXACfY7DkEdXFVYLG564mc3Nk1pD6 63MAn3d6va2Zo5Xa+ztD0boIyLVkayRa =bQnJ -END PGP SIGNATURE- ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] IAX for internet file transfer?
On Fri, Jun 26, 2009 at 8:39 PM, Moises Silva wrote: [cut] > > I would think IAX ack just the signaling frames, not every single audio > frame, does it? That's correct. But I don't see why that can't be changed. Of course the Audio doesn't have to be reliable you can loose a few 20 ms frames and you'll be fine. But the digital data has to be so it would be treated as control frames so to speak. Martin ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] IAX for internet file transfer?
On Fri, Jun 26, 2009 at 07:50:08PM -0500, Moises Silva wrote: > On Fri, Jun 26, 2009 at 6:48 PM, Maris wrote: > > > I'm dealing with an idea to exchange data in a socket connection style > > or a sort of ftp transfer with IAX2 as the transport medium. > > > > An IAX client on e.g. a notebook could establish a connection to any > > remote machine (also client) via any Asterisk Server where both > > clients are registered. Due to the unique properties of IAX2 one > > could connect quite easily to any "hidden" remote computer without > > server functionality and exchange data. > > > > To my opinion it should be quite simple to bypass audio->RTP packet > > conversion in order to allow digital data transmission. > > > Just a question since I am not quite sure I understand your suggestion. > > How do you plan to reliably transmit a file through UDP which does not > guarantee delivery?, not to mention that IAX2 does not use RTP. Are you > suggesting to change the protocol to support such transfers? UDP does not in itself mean that there's no reliability. Reliability can be built on top of UDP. However an audio stream will make sens eve if we dop a pacet or to. OTOH, if even you have all the data time on and it's just not the in right order, you get a mess. Which could hopefully be worked around with a nice delay of a second or two. But then we have a waltie-talkie and not a phone. So while you can basically encode your data into an audio file, send it to the other side and decode it there Asterisk (or just about any VoIP software) will opt for timely delivery rather than a reliable delivery. -- Tzafrir Cohen icq#16849755 jabber:tzafrir.co...@xorcom.com +972-50-7952406 mailto:tzafrir.co...@xorcom.com http://www.xorcom.com iax:gu...@local.xorcom.com/tzafrir ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] IAX for internet file transfer?
On Fri, Jun 26, 2009 at 8:26 PM, Martin wrote: > I'm sure he meant UDP not RTP. > > In order to guarantee the delivery you can simply do what IAX already > does ... ACK the > frames. This is what TCP does and ISDN PRI protocol layer 2 on the T1/E1. > > But why does he want to do it ? Share secret / illegal files LOL ? > > Martin > I would think IAX ack just the signaling frames, not every single audio frame, does it? -- Moises Silva Software Developer Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R 9T3 Canada t. 1 905 474 1990 x 128 | e. m...@sangoma.com ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] IAX for internet file transfer?
I'm sure he meant UDP not RTP. In order to guarantee the delivery you can simply do what IAX already does ... ACK the frames. This is what TCP does and ISDN PRI protocol layer 2 on the T1/E1. But why does he want to do it ? Share secret / illegal files LOL ? Martin On Fri, Jun 26, 2009 at 7:50 PM, Moises Silva wrote: > On Fri, Jun 26, 2009 at 6:48 PM, Maris wrote: >> >> I'm dealing with an idea to exchange data in a socket connection style >> or a sort of ftp transfer with IAX2 as the transport medium. >> >> An IAX client on e.g. a notebook could establish a connection to any >> remote machine (also client) via any Asterisk Server where both >> clients are registered. Due to the unique properties of IAX2 one >> could connect quite easily to any "hidden" remote computer without >> server functionality and exchange data. >> >> To my opinion it should be quite simple to bypass audio->RTP packet >> conversion in order to allow digital data transmission. > > Just a question since I am not quite sure I understand your suggestion. > > How do you plan to reliably transmit a file through UDP which does not > guarantee delivery?, not to mention that IAX2 does not use RTP. Are you > suggesting to change the protocol to support such transfers? > > -- > Moises Silva > Software Developer > Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R 9T3 > Canada > t. 1 905 474 1990 x 128 | e. m...@sangoma.com > > ___ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] IAX for internet file transfer?
On Fri, Jun 26, 2009 at 6:48 PM, Maris wrote: > I'm dealing with an idea to exchange data in a socket connection style > or a sort of ftp transfer with IAX2 as the transport medium. > > An IAX client on e.g. a notebook could establish a connection to any > remote machine (also client) via any Asterisk Server where both > clients are registered. Due to the unique properties of IAX2 one > could connect quite easily to any "hidden" remote computer without > server functionality and exchange data. > > To my opinion it should be quite simple to bypass audio->RTP packet > conversion in order to allow digital data transmission. Just a question since I am not quite sure I understand your suggestion. How do you plan to reliably transmit a file through UDP which does not guarantee delivery?, not to mention that IAX2 does not use RTP. Are you suggesting to change the protocol to support such transfers? -- Moises Silva Software Developer Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R 9T3 Canada t. 1 905 474 1990 x 128 | e. m...@sangoma.com ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[asterisk-users] IAX for internet file transfer?
I'm dealing with an idea to exchange data in a socket connection style or a sort of ftp transfer with IAX2 as the transport medium. An IAX client on e.g. a notebook could establish a connection to any remote machine (also client) via any Asterisk Server where both clients are registered. Due to the unique properties of IAX2 one could connect quite easily to any "hidden" remote computer without server functionality and exchange data. To my opinion it should be quite simple to bypass audio->RTP packet conversion in order to allow digital data transmission. ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
