Does anyone try to use TTS and Voice recognition with Asterisk? Help me if so
----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, April 14, 2004 1:42 PM Subject: Asterisk-Dev digest, Vol 1 #570 - 8 msgs > Send Asterisk-Dev mailing list submissions to > [EMAIL PROTECTED] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.digium.com/mailman/listinfo/asterisk-dev > or, via email, send a message with subject or body 'help' to > [EMAIL PROTECTED] > > You can reach the person managing the list at > [EMAIL PROTECTED] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Asterisk-Dev digest..." > > > Today's Topics: > > 1. Re: Re: 802.11b a contraindication? (Olle E. Johansson) > 2. Re: Re: 802.11b a contraindication? (Duane) > 3. Re: Asterisk Codecs Extension (Alex Volkov) > 4. RE: Asterisk Codecs Extension (Pedro Bessa Goncalves) > 5. Re: How many users can one Asterisk server support? (Nicolas Bougues) > 6. Who is developing Shadydial? (Richard Airlie) > 7. H263 SIP Video Playback (Pedro Bessa Goncalves) > 8. Re: Re: 802.11b a contraindication? (Rich Adamson) > > --__--__-- > > Message: 1 > Date: Wed, 14 Apr 2004 08:21:30 +0200 > From: "Olle E. Johansson" <[EMAIL PROTECTED]> > Organization: Edvina AB > To: [EMAIL PROTECTED] > Subject: Re: [Asterisk-Dev] Re: 802.11b a contraindication? > Reply-To: [EMAIL PROTECTED] > > > I agree that a more specific understanding of interactions between > > 802.11[b,a,g] and SIP RTP sessions would be worthwhile if it could be > > found or generated and posted to this list. Additionally, what would be > > more worthwhile would be a similar IAX2 study. I'll put this on my > > long and un-cheery list of "things to be tested", right beside satellite > > latency effects on IAX2... > > Some AP's claim they prioritize voice - I don't know how. Symbol have said > that for a long time, and they supported H.323 in their equipment. There's > a new QoS standard for 802.11, but I don't know how that works with various > protocols or equipments. Check 802.11e. > > For more infromation on VOW (voice over WiFi): > > http://www.wi-fiplanet.com/tutorials/article.php/2171721 > http://www.vonmag.com/issue/2003/sepoct/features/voice_over_wifi.htm > > /O > > --__--__-- > > Message: 2 > Date: Wed, 14 Apr 2004 16:56:03 +1000 > From: Duane <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] > Subject: Re: [Asterisk-Dev] Re: 802.11b a contraindication? > Reply-To: [EMAIL PROTECTED] > > Olle E. Johansson wrote: > > Some AP's claim they prioritize voice - I don't know how. Symbol have said > > that for a long time, and they supported H.323 in their equipment. There's > > a new QoS standard for 802.11, but I don't know how that works with various > > protocols or equipments. Check 802.11e. > > The way I think Cisco was planning to priorities traffic was using VLANs > that cheat basically... > > With the 802.11b timing there is a small slice (1 or 7uS i think, too > long ago) that isn't currently being used for anything, was set aside > for QoS or something in the original spec but never used later on, so > what they do is add this slice to voice traffic's timing to give it a > higher chance of beating other clients from transmitting... > > -- > Best regards, > Duane > > http://www.cacert.org - Free Security Certificates > http://www.nodedb.com - Think globally, network locally > http://www.sydneywireless.com - Telecommunications Freedom > http://happysnapper.com.au - Sell your photos over the net! > http://e164.org - Using Enum.164 to interconnect asterisk servers > > --__--__-- > > Message: 3 > From: "Alex Volkov" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Subject: Re: [Asterisk-Dev] Asterisk Codecs Extension > Date: Wed, 14 Apr 2004 03:20:11 -0400 > Reply-To: [EMAIL PROTECTED] > > This is a multi-part message in MIME format. > > ------=_NextPart_000_03F7_01C421CF.65194BC0 > Content-Type: text/plain; > charset="iso-8859-1" > Content-Transfer-Encoding: quoted-printable > > Asterisk Codecs ExtensionPedro, > > Simply look at any codec code in asterisk/codecs/. I suggest = > codec_ulaw.c or codec_alaw.c. The bulk of both of these is the necessary = > interfacing code to make whatever-generic-codec work with asterisk, and = > the actual conversions from xlaw to PCM and back are simple 2-liner = > loops. Once you understand the basic structure of an * codec, look at = > codec_g723_1.c for an example on how to handle a whatever-generic-codec = > that is an opaque library. > Model your new * codec on those, as I think those provide the best = > examples of an adaptation/abstraction layer. > > Cheers! > Alex. > ----- Original Message -----=20 > From: Pedro Bessa Goncalves=20 > To: [EMAIL PROTECTED] Digium. Com ([EMAIL PROTECTED])=20 > Sent: Tuesday, April 13, 2004 7:35 AM > Subject: [Asterisk-Dev] Asterisk Codecs Extension > > > Hi, does anyone know the required function headers for extending = > Asterisk codecs?=20 > Is there another way to import 3rd party codecs?=20 > > Thank you,=20 > Pedro Goncalves=20 > > ------=_NextPart_000_03F7_01C421CF.65194BC0 > Content-Type: text/html; > charset="iso-8859-1" > Content-Transfer-Encoding: quoted-printable > > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> > <HTML><HEAD><TITLE>Asterisk Codecs Extension</TITLE> > <META http-equiv=3DContent-Type content=3D"text/html; = > charset=3Diso-8859-1"> > <META content=3D"MSHTML 6.00.2800.1106" name=3DGENERATOR> > <STYLE></STYLE> > </HEAD> > <BODY bgColor=3D#ffffff> > <DIV><FONT face=3DArial size=3D2>Pedro,</FONT></DIV> > <DIV><FONT face=3DArial size=3D2></FONT> </DIV> > <DIV><FONT face=3DArial size=3D2>Simply look at any codec code in = > asterisk/codecs/.=20 > I suggest codec_ulaw.c or codec_alaw.c. The bulk of both of these is the = > > necessary interfacing code to make whatever-generic-codec work with = > asterisk,=20 > and the actual conversions from xlaw to PCM and back are simple 2-liner = > loops.=20 > Once you understand the basic structure of an * codec, look at = > codec_g723_1.c=20 > for an example on how to handle a whatever-generic-codec that is = > an opaque=20 > library.</FONT></DIV> > <DIV><FONT face=3DArial size=3D2>Model your new * codec on those, = > as I think=20 > those provide the best examples of an adaptation/abstraction = > layer.</FONT></DIV> > <DIV><FONT face=3DArial size=3D2></FONT> </DIV> > <DIV><FONT face=3DArial size=3D2>Cheers!</FONT></DIV> > <DIV><FONT face=3DArial size=3D2>Alex.</FONT></DIV> > <BLOCKQUOTE dir=3Dltr=20 > style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = > BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> > <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV> > <DIV=20 > style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = > black"><B>From:</B>=20 > <A [EMAIL PROTECTED] > href=3D"mailto:[EMAIL PROTECTED]">Pedro Bessa = > Goncalves</A> </DIV> > <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20 > [EMAIL PROTECTED] > href=3D"mailto:[EMAIL PROTECTED] Digium. Com = > ([EMAIL PROTECTED])">[EMAIL PROTECTED] > Digium. Com ([EMAIL PROTECTED])</A> </DIV> > <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, April 13, 2004 = > 7:35=20 > AM</DIV> > <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [Asterisk-Dev] = > Asterisk Codecs=20 > Extension</DIV> > <DIV><BR></DIV> > <P><FONT size=3D2>Hi, does anyone know the required function headers = > for=20 > extending Asterisk codecs?</FONT> <BR><FONT size=3D2>Is there another = > way to=20 > import 3rd party codecs?</FONT> </P> > <P><FONT size=3D2>Thank you,</FONT> <BR><FONT size=3D2>Pedro = > Goncalves</FONT>=20 > </P></BLOCKQUOTE></BODY></HTML> > > ------=_NextPart_000_03F7_01C421CF.65194BC0-- > > > --__--__-- > > Message: 4 > From: Pedro Bessa Goncalves <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] > Subject: RE: [Asterisk-Dev] Asterisk Codecs Extension > Date: Wed, 14 Apr 2004 10:57:44 +0100 > Reply-To: [EMAIL PROTECTED] > > This message is in MIME format. Since your mail reader does not understand > this format, some or all of this message may not be legible. > > ------_=_NextPart_001_01C42206.EF170D30 > Content-Type: text/plain > > Hi Alex, what if the codec I want to add is for video? I noticed H263 is > only available in asterisk/formats/. Does that mean H263 is only being coded > in client side and being passed-through by *? > > In that case, if I wanted to support the pass-through of a video stream the > only thing I would have to do would be changing the SIP header to indicate > the new codec name? > > > > Thank you, > > Pedro > > > > _____ > > From: Alex Volkov [mailto:[EMAIL PROTECTED] > Sent: quarta-feira, 14 de Abril de 2004 8:20 > To: [EMAIL PROTECTED] > Subject: Re: [Asterisk-Dev] Asterisk Codecs Extension > > > > Pedro, > > > > Simply look at any codec code in asterisk/codecs/. I suggest codec_ulaw.c or > codec_alaw.c. The bulk of both of these is the necessary interfacing code to > make whatever-generic-codec work with asterisk, and the actual conversions > from xlaw to PCM and back are simple 2-liner loops. Once you understand the > basic structure of an * codec, look at codec_g723_1.c for an example on how > to handle a whatever-generic-codec that is an opaque library. > > Model your new * codec on those, as I think those provide the best examples > of an adaptation/abstraction layer. > > > > Cheers! > > Alex. > > ----- Original Message ----- > > From: Pedro Bessa Goncalves <mailto:[EMAIL PROTECTED]> > > To: [EMAIL PROTECTED] Digium. Com > <mailto:[EMAIL PROTECTED]([EMAIL PROTECTED] > )> ([EMAIL PROTECTED]) > > Sent: Tuesday, April 13, 2004 7:35 AM > > Subject: [Asterisk-Dev] Asterisk Codecs Extension > > > > Hi, does anyone know the required function headers for extending Asterisk > codecs? > Is there another way to import 3rd party codecs? > > Thank you, > Pedro Goncalves > > > ------_=_NextPart_001_01C42206.EF170D30 > Content-Type: text/html > Content-Transfer-Encoding: quoted-printable > > <html xmlns:v=3D"urn:schemas-microsoft-com:vml" = > xmlns:o=3D"urn:schemas-microsoft-com:office:office" = > xmlns:w=3D"urn:schemas-microsoft-com:office:word" = > xmlns=3D"http://www.w3.org/TR/REC-html40";> > > <head> > <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; = > charset=3Dus-ascii"> > > > <meta name=3DGenerator content=3D"Microsoft Word 11 (filtered medium)"> > <!--[if !mso]> > <style> > v\:* {behavior:url(#default#VML);} > o\:* {behavior:url(#default#VML);} > w\:* {behavior:url(#default#VML);} > .shape {behavior:url(#default#VML);} > </style> > <![endif]--> > <title>Asterisk Codecs Extension</title> > <style> > <!-- > /* Font Definitions */ > @font-face > {font-family:Tahoma; > panose-1:2 11 6 4 3 5 4 4 2 4;} > /* Style Definitions */ > p.MsoNormal, li.MsoNormal, div.MsoNormal > {margin:0cm; > margin-bottom:.0001pt; > font-size:12.0pt; > font-family:"Times New Roman";} > a:link, span.MsoHyperlink > {color:blue; > text-decoration:underline;} > a:visited, span.MsoHyperlinkFollowed > {color:blue; > text-decoration:underline;} > p > {mso-margin-top-alt:auto; > margin-right:0cm; > mso-margin-bottom-alt:auto; > margin-left:0cm; > font-size:12.0pt; > font-family:"Times New Roman";} > span.EmailStyle18 > {mso-style-type:personal-reply; > font-family:Arial; > color:navy;} > @page Section1 > {size:612.0pt 792.0pt; > margin:72.0pt 90.0pt 72.0pt 90.0pt;} > div.Section1 > {page:Section1;} > --> > </style> > <!--[if gte mso 9]><xml> > <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> > </xml><![endif]--><!--[if gte mso 9]><xml> > <o:shapelayout v:ext=3D"edit"> > <o:idmap v:ext=3D"edit" data=3D"1" /> > </o:shapelayout></xml><![endif]--> > </head> > > <body bgcolor=3Dwhite lang=3DEN-US link=3Dblue vlink=3Dblue> > > <div class=3DSection1> > > <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = > style=3D'font-size: > 10.0pt;font-family:Arial;color:navy'>Hi Alex, what if the codec I want = > to add is > for video? I noticed H263 is only available in asterisk/formats/. Does = > that > mean H263 is only being coded in client side and being passed-through = > by *?<o:p></o:p></span></font></p> > > <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = > style=3D'font-size: > 10.0pt;font-family:Arial;color:navy'>In that case, if I wanted to = > support the > pass-through of a video stream the only thing I would have to do would = > be > changing the SIP header to indicate the new codec = > name?<o:p></o:p></span></font></p> > > <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = > style=3D'font-size: > 10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>= > > > <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = > style=3D'font-size: > 10.0pt;font-family:Arial;color:navy'>Thank = > you,<o:p></o:p></span></font></p> > > <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = > style=3D'font-size: > 10.0pt;font-family:Arial;color:navy'>Pedro<o:p></o:p></span></font></p> > > <p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span = > style=3D'font-size: > 10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>= > > > <div> > > <div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font = > size=3D3 > face=3D"Times New Roman"><span style=3D'font-size:12.0pt'> > > <hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1> > > </span></font></div> > > <p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span = > style=3D'font-size:10.0pt; > font-family:Tahoma;font-weight:bold'>From:</span></font></b><font = > size=3D2 > face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> Alex = > Volkov > [mailto:[EMAIL PROTECTED] <br> > <b><span style=3D'font-weight:bold'>Sent:</span></b> quarta-feira, 14 = > de Abril de > 2004 8:20<br> > <b><span style=3D'font-weight:bold'>To:</span></b> = > [EMAIL PROTECTED]<br> > <b><span style=3D'font-weight:bold'>Subject:</span></b> Re: = > [Asterisk-Dev] > Asterisk Codecs Extension</span></font><o:p></o:p></p> > > </div> > > <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = > style=3D'font-size: > 12.0pt'><o:p> </o:p></span></font></p> > > <div> > > <p class=3DMsoNormal><font size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt; > font-family:Arial'>Pedro,</span></font><o:p></o:p></p> > > </div> > > <div> > > <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = > style=3D'font-size: > 12.0pt'> <o:p></o:p></span></font></p> > > </div> > > <div> > > <p class=3DMsoNormal><font size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt; > font-family:Arial'>Simply look at any codec code in asterisk/codecs/. I = > suggest > codec_ulaw.c or codec_alaw.c. The bulk of both of these is the = > necessary > interfacing code to make whatever-generic-codec work with asterisk, and = > the > actual conversions from xlaw to PCM and back are simple 2-liner loops. = > Once you > understand the basic structure of an * codec, look at codec_g723_1.c = > for an > example on how to handle a whatever-generic-codec that is = > an opaque > library.</span></font><o:p></o:p></p> > > </div> > > <div> > > <p class=3DMsoNormal><font size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt; > font-family:Arial'>Model your new * codec on those, as I think = > those > provide the best examples of an adaptation/abstraction = > layer.</span></font><o:p></o:p></p> > > </div> > > <div> > > <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = > style=3D'font-size: > 12.0pt'> <o:p></o:p></span></font></p> > > </div> > > <div> > > <p class=3DMsoNormal><font size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt; > font-family:Arial'>Cheers!</span></font><o:p></o:p></p> > > </div> > > <div> > > <p class=3DMsoNormal><font size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt; > font-family:Arial'>Alex.</span></font><o:p></o:p></p> > > </div> > > <blockquote style=3D'border:none;border-left:solid black = > 1.5pt;padding:0cm 0cm 0cm 4.0pt; > margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt= > '> > > <div> > > <p class=3DMsoNormal><font size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt; > font-family:Arial'>----- Original Message ----- = > <o:p></o:p></span></font></p> > > </div> > > <div style=3D'font-color:black'> > > <p class=3DMsoNormal style=3D'background:#E4E4E4'><b><font size=3D2 = > face=3DArial><span > style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</spa= > n></font></b><font > size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt;font-family:Arial'> <a > href=3D"mailto:[EMAIL PROTECTED]" > title=3D"[EMAIL PROTECTED]">Pedro Bessa Goncalves</a> = > <o:p></o:p></span></font></p> > > </div> > > <div> > > <p class=3DMsoNormal><b><font size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt; > font-family:Arial;font-weight:bold'>To:</span></font></b><font size=3D2 > face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'> <a > href=3D"mailto:[EMAIL PROTECTED]([EMAIL PROTECTED] > .digium.com)" > title=3D"[EMAIL PROTECTED]">[EMAIL PROTECTED] Digium. Com > ([EMAIL PROTECTED])</a> <o:p></o:p></span></font></p> > > </div> > > <div> > > <p class=3DMsoNormal><b><font size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt; > font-family:Arial;font-weight:bold'>Sent:</span></font></b><font = > size=3D2 > face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'> = > Tuesday, April 13, > 2004 7:35 AM<o:p></o:p></span></font></p> > > </div> > > <div> > > <p class=3DMsoNormal><b><font size=3D2 face=3DArial><span = > style=3D'font-size:10.0pt; > font-family:Arial;font-weight:bold'>Subject:</span></font></b><font = > size=3D2 > face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'> = > [Asterisk-Dev] > Asterisk Codecs Extension<o:p></o:p></span></font></p> > > </div> > > <div> > > <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = > style=3D'font-size: > 12.0pt'><o:p> </o:p></span></font></p> > > </div> > > <p><font size=3D2 face=3D"Times New Roman"><span = > style=3D'font-size:10.0pt'>Hi, does > anyone know the required function headers for extending Asterisk = > codecs?</span></font> > <br> > <font size=3D2><span style=3D'font-size:10.0pt'>Is there another way to = > import 3rd > party codecs?</span></font> <o:p></o:p></p> > > <p><font size=3D2 face=3D"Times New Roman"><span = > style=3D'font-size:10.0pt'>Thank > you,</span></font> <br> > <font size=3D2><span style=3D'font-size:10.0pt'>Pedro = > Goncalves</span></font> <o:p></o:p></p> > > </blockquote> > > </div> > > </body> > > </html> > > ------_=_NextPart_001_01C42206.EF170D30-- > > --__--__-- > > Message: 5 > Date: Wed, 14 Apr 2004 12:02:54 +0200 > From: Nicolas Bougues <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] > Subject: Re: [Asterisk-Dev] How many users can one Asterisk server support? > Organization: Axialys Interactive http://www.axialys.net > Reply-To: [EMAIL PROTECTED] > > On Sun, Apr 11, 2004 at 12:57:30AM -0500, Steven Sokol wrote: > > > The question is > > > how do we link up these servers and allow any user come in on any servers? > > > > > > Have anyone tried this? > > > > > > > Unfortunately, Asterisk stores the registration information locally, rather > > than in some centrally located data store. In order to use it the way you > > want, you either need to alter it to use a central registry, or assign > > customers to specific servers. > > > > This is not always easily doable, due to NAT issues. > > If some SIP phone is behind a NAT gateway, another Asterisk server > (different from the one having received the registration) won't > necessarily be able to reach the phone behind the NAT. Thus the whole > SIP registry shall not be directly shared, but calls should be > forwarded from one server to another, using existing registration > info. > > Or another, possibly simpler solution is to set users to different > servers based on their login or something. > > -- > Nicolas Bougues > Axialys Interactive > > --__--__-- > > Message: 6 > Date: Wed, 14 Apr 2004 11:14:38 +0100 > From: Richard Airlie <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] > Subject: [Asterisk-Dev] Who is developing Shadydial? > Reply-To: [EMAIL PROTECTED] > > I've been looking at the information on Shadydial at > shadydial.sourceforge.net, but can't find a contact address or even a name > of the author(s). > > I'm interested in finding out a bit more information about how well shadydial > performs, what sort of real world usage it's seen, etc. Can anyone shed any > light? > > best, > Richard > > --__--__-- > > Message: 7 > From: Pedro Bessa Goncalves <[EMAIL PROTECTED]> > To: "[EMAIL PROTECTED] Digium. Com ([EMAIL PROTECTED])" <[EMAIL PROTECTED]>, > "[EMAIL PROTECTED] Digium. Com ([EMAIL PROTECTED])" <[EMAIL PROTECTED]> > Date: Wed, 14 Apr 2004 11:40:05 +0100 > Subject: [Asterisk-Dev] H263 SIP Video Playback > Reply-To: [EMAIL PROTECTED] > > This message is in MIME format. Since your mail reader does not understand > this format, some or all of this message may not be legible. > > ------_=_NextPart_001_01C4220C.D99EC730 > Content-Type: text/plain > > Hi. Was anyone able to send an H263 to SIP clients through any Asterisk play > function? > If so, which h263 test files did you use? > > Thank you, > Pedro Goncalves > > ------_=_NextPart_001_01C4220C.D99EC730 > Content-Type: text/html > > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> > <HTML> > <HEAD> > <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> > <META NAME="Generator" CONTENT="MS Exchange Server version 5.5.2654.45"> > <TITLE>H263 SIP Video Playback</TITLE> > </HEAD> > <BODY> > > <P><FONT SIZE=2>Hi. Was anyone able to send an H263 to SIP clients through any Asterisk play function?</FONT> > <BR><FONT SIZE=2>If so, which h263 test files did you use?</FONT> > </P> > > <P><FONT SIZE=2>Thank you,</FONT> > <BR><FONT SIZE=2>Pedro Goncalves</FONT> > </P> > > </BODY> > </HTML> > ------_=_NextPart_001_01C4220C.D99EC730-- > > --__--__-- > > Message: 8 > Date: Wed, 14 Apr 2004 06:21:52 -0600 > From: Rich Adamson <[EMAIL PROTECTED]> > Subject: Re: [Asterisk-Dev] Re: 802.11b a contraindication? > To: [EMAIL PROTECTED] > Reply-To: [EMAIL PROTECTED] > > > > I agree that a more specific understanding of interactions between > > > 802.11[b,a,g] and SIP RTP sessions would be worthwhile if it could be > > > found or generated and posted to this list. Additionally, what would be > > > more worthwhile would be a similar IAX2 study. I'll put this on my > > > long and un-cheery list of "things to be tested", right beside satellite > > > latency effects on IAX2... > > > > Some AP's claim they prioritize voice - I don't know how. Symbol have said > > that for a long time, and they supported H.323 in their equipment. There's > > a new QoS standard for 802.11, but I don't know how that works with various > > protocols or equipments. Check 802.11e. > > There are only two common ways that network hardware supports QoS. One > method has been to watch for the specific IP ports used by sip or h323, > looking inside those packets to watch for rtp port negotiation, and then > prioritize the traffic seen on those ports. The cisco pix firewall does > something like that with their "fixup" statements for allowing access (not > QoS). > > The second common way is to watch the TOS (Type of Service) bits in the IP > header, and prioritize the traffic based on specific bit patterns. That's > one typical way to handle QoS in cisco routers as an example. > > I'm with Olle in that I don't know what Symbol or others have actually > implemented, however out of the box there aren't very many network devices > that truly support QoS in any form. And, in most cases if they do support > some form of QoS prioritization, their support is not well documented in > their marketing/sales material or spec sheets. > > QoS really does not do much good unless the majority of network devices > between the voip endpoints all support QoS. In the case of AP's, there is > already a problem with queuing prior to the voip traffic "reaching" the > AP from the wireless client (eg, queuing to grab a piece of the wireless > bandwidth does not involve QoS). > > Even if all network devices support QoS, managing the queues is still a > major operational problem. E.g., what happens when the high priority > queue is full and additional traffic arrives? How do you know when the > queue is full and how do you know when to add more bandwidth? I've been > doing professional network performance analysis for corporations in 40+ > states since 1993, and I've not seen any network support organization > truly manage their bandwidth or network quality yet, let alone QoS. > > If one thinks about how current wireless endpoints control the quality > of wireless transmission by varying bandwidth, and combine that with how > one manages the QoS queues, don't think there will be any real > implementations that actually work using current technology. The current > stuff does work fine with voip for low usage wireless links, but as that > traffic increases (or one/two wireless devices hog bandwidth) the voip > traffic will be impacted one way or another. > > Those of us that have analyzed iax and iax2 queuing already know that > well designed jitter buffers (etc) can handle 500 millisecond latency > with hugh jitter variations and maintain quality audio. In the short > term, there is more to be gained in optimizing the jitter buffers then > there is in truly attempting to manage QoS on an end-to-end network > basis. (Obviously there are some examples of where QoS can have a > significant impact though, but most are temporary point solutions.) > > Rich > > > > > --__--__-- > > _______________________________________________ > Asterisk-Dev mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-dev > > > End of Asterisk-Dev Digest _______________________________________________ Asterisk-Dev mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-dev To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-dev
