[Asterisk-video] H324M 3G ISDN

Tue Jul 25 05:17:22 MST 2006

Forget what i said, i made the h223 muxer/demuxer some time ago and answered absolutelly wrong.

The h324m levels are: 

-level 0: h223 without anexes, no byte aligment, 1 byte flag and hdlc bit stuffing,1 byte header (mc,mpl,hec)
-level 1: h223 anex A, 2 byte flag, 1 byte header (mc,mpl,hec), and CCSRL
-level 2: h223 anex B, 2 byte flag, 3 byte header and ccsrl
-level 3: h223 anex C, another world.. 
________________________________

From: asterisk-video-bounces at lists.digium.com [mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Ramtin Amin
Sent: martes, 25 de julio de 2006 13:39
To: Development discussion of video media support in Asterisk
Subject: RE: [Asterisk-video] H324M 3G ISDN

I see that anexe B uses a 3 Byte header MC1 -> MC4 MPL1 -> MPL8 P1 -> P12 = 24 bits = 3 byte ?
So if I understood well, I have to see if the first byte correspond to the rules for anexe A's checksum or annex B's matrix ?

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	Subject: RE: [Asterisk-video] H324M 3G ISDN
	Date: Tue, 25 Jul 2006 13:25:48 +0200
	From: Sergio.Garcia at ydilo.com
	To: asterisk-video at lists.digium.com

	Anex A uses a 1 byte header and anes B uses the 2 bytes one (anex C i don't care.. :)
	I don't think the echo is going to work, for example the master-slave negotiation would never end.

________________________________

	From: asterisk-video-bounces at lists.digium.com [mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Ramtin Amin
	Sent: martes, 25 de julio de 2006 13:16
	To: Development discussion of video media support in Asterisk
	Subject: RE: [Asterisk-video] H324M 3G ISDN

	Thx Sergio
	How do you figure out if it's complient to annexe A, B, or C... ? And also, do you think that if I do just something like
	exten => s,1,Answer()
	exten => s,2,echo()
	Would I bee able to see myself in the 3G device ?
	thx

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		Subject: RE: [Asterisk-video] H324M 3G ISDN
		Date: Tue, 25 Jul 2006 13:12:48 +0200
		From: Sergio.Garcia at ydilo.com
		To: asterisk-video at lists.digium.com

		The 00 00 00 is the mux stuffing pdu as described in anex b.

________________________________

		From: asterisk-video-bounces at lists.digium.com [mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Ramtin Amin
		Sent: martes, 25 de julio de 2006 13:09
		To: Development discussion of video media support in Asterisk
		Subject: RE: [Asterisk-video] H324M 3G ISDN

		If someone is interested, here is some RAW data without byteswap I could get by echoing the data coming from the B channel
		So in there we can see the "87B2000000" that repeats non stop and 87 B2 is 10000111 10110010 and Byteswaped -->> 11100001 01001101 which is E1 4D which is the H223 flag as said in annex A.2.1.1 Figure A.1/H223
		I guess the 000000 means channel 0 which is H245 ? Could someone give some info about it ???

		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			Subject: RE: [Asterisk-video] H324M 3G ISDN
			Date: Tue, 25 Jul 2006 07:58:50 +0200
			From: Sergio.Garcia at ydilo.com
			To: asterisk-video at lists.digium.com

			I modified the q931 transmit_bearer_capability send function to 

			        ie->data[0] = 0x88;
			        ie->data[1] = 0x90;
			        ie->data[2] = 0xA6;
			        return 5;

			I'm using only outgoing calls due to limitations in our main PBX configuration, so i don't know if there is anything else needed to accept incomming calls.

________________________________

			From: asterisk-video-bounces at lists.digium.com [mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Ramtin Amin
			Sent: lunes, 24 de julio de 2006 18:59
			To: Development discussion of video media support in Asterisk
			Subject: RE: [Asterisk-video] H324M 3G ISDN

			Would you tell us what you put in the q931.c of the libpri for making asterisk accept the SETUP with the 64kb data option ?
			Basically what did you modify ?
			Thx

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				Subject: RE: [Asterisk-video] H324M 3G ISDN
				Date: Mon, 24 Jul 2006 08:34:52 +0200
				From: Sergio.Garcia at ydilo.com
				To: asterisk-video at lists.digium.com

				H223 Annex B without double headres (H324M level 2). 
				If you are looking at the UCLA/Samsung h223 simulator i understand that you think it's not easy, but i have still not found any device (phone or gateway), that implements annex C.
				I use zaptel and a libpri, it would need some modification in order to be configurable, but hardcoding the q931 setup info is quite easy.

________________________________

				From: asterisk-video-bounces at lists.digium.com [mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Ramtin Amin
				Sent: lunes, 24 de julio de 2006 8:26
				To: Development discussion of video media support in Asterisk
				Subject: RE: [Asterisk-video] H324M 3G ISDN

				Well I'm working on ir currently
				So if we want to do it, since it doesn't look that easy, we better share our knowledge about it.
				Sergio: In H223, which annexe is used ?
				I've found some interesting stuff capable of handling the H223+245 but I wanted to understand it more and when you look at the ITU, and it gets into the Golay(24,12) and BCH code, it starts to become more complicated :)
				Tell us more about your expiriance: you modified the libpri for answering correctly the q.931 ? You use /don't use  zaptel ? How do you capture raw data ? cat /dev/zap/12 ? or with an app_zapgrab ?
				DO you use BRI or PRI ?

________________________________

					Subject: RE: [Asterisk-video] H324M 3G ISDN
					Date: Mon, 24 Jul 2006 08:15:06 +0200
					From: Sergio.Garcia at ydilo.com
					To: asterisk-video at lists.digium.com

					Hi everyone, 

					    It's good to see that i'm not the only one developping int this subject. 
					I have been working on an h234M library, i have finished AL1 and AL2 of h223 (level 2 profile), and almost finished the h245 negotiators. I have been able to establish a videocall between an asterisk box and a motorola phone, but i'm having problems with the negotiations on other phones. 
					Are any one of you going to start an open source proyect?

					Greetings 
					    Sergio

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