Re: [Asterisk-Users] Modem => Serial ?
> > Actually Dan, you are mistaken here, many serial fax/data/voice modems > > come with answering machine programs which tell the modem to > > send the voice data through the serial line. Also the vgetty > > program in linux does the same. > > The problem is using the AT command set, not whether or not serial > communications can carry voice. Remember that T1 is just a really fast > serial line. > > The AT command set is a remnant of low power computing. You issue a > command to get started with voice mode. Then you set it in record mode, > and look to see if there is incoming audio. Then you issue a command to > send audio when you have some in your queue. This is WRONG. Please lookup the (AT) VTR command - simultaneous voice transmit and receive that gives full duplex for modems that support it (including iNTRA2/4/8 in Australia, according to the manufaturer) I spent a long time researching this (just try googling for VTR and see how many Video Tape Recorders you will find...) some months ago when I first started talking about using full duplex voice modems. All this time I thought you kept ignoring me because of financial reasons (ie maybe you would be getting the zaptel approved for australia) not because you thought I didn`t know what I was talking about ;-) Check these links: http://www.vee90.net/atcom/BCM/v92/BCMV92_Modem7.html http://pcdesguide.org/pc99/chapt19.htm which references the the ITU-T V.253 standard - "V.253 includes small corrections to TIA-695 and adds provisions for bi-directional, digitized voice over the serial port." (personally afaik full duplex voice over serial sucks however - not a problem with PCI cards tho) http://www.vocpsystem.com/vgetty_modems.php?mode=function - the best site (which I just spent the last half-hour finding again...) Cheers, Mathew ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Modem => Serial ?
Hi, Check: http://www.smlink.com/download/Linux/slmdm-2.7.14.tar.gz This is the modem I talk about Smartlink SM56 USB version This is extracted from the README file: Features Modem: V.92, V.90, V.34, V.32bis, V.23, V.22, V.21, Bell 103/212. Flow control: V.42, MNP 2-4. Compression: V.44, V.42bis, MNP5. Fax: Class 1. Voice: ADPCM voice compression, Digital Answering Machine. Supported Hardware == HAMR5600 based AMR/CNR/MDC/ACR modem cards on the following Southbridge chips: - Intel ICH0, ICH2 - Via 686A, 686B, 8231, 8233 - SiS 630 - ALI 1535. SmartPCI56/561/562/563 based PCI modem cards. SmartUSB56 based USB modem. BR, Dan - Original Message - From: "Steven Critchfield" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, June 04, 2003 1:55 PM Subject: Re: [Asterisk-Users] Modem => Serial ? > The problem with the few softmodem drivers I've dealt with is that parts > of the driver are _NOT_ in source form. The parts that are in source > form are basically a serial interface to the dsp library that does > direct hardware access as it would have kernel level privs from having > been called from inside the kernel. > > I'm interested in documenting a dsp library that is available for a > software modem and seeing if it could be a resource for asterisk to > create a modem interface. But this is a project probably for the > fall/winter. > > On Wed, 2003-06-04 at 05:38, Dan wrote: > > With a software modem, you cannot bypass AT commands and directly acces the > > hardware for voice applications, as you have the source code for the modem > > driver himself? > > > > BR, > > Dan > > > > > > > The problem is using the AT command set, not whether or not serial > > > communications can carry voice. Remember that T1 is just a really fast > > > serial line. > > > > > > The AT command set is a remnant of low power computing. You issue a > > > command to get started with voice mode. Then you set it in record mode, > > > and look to see if there is incoming audio. Then you issue a command to > > > send audio when you have some in your queue. > > > > > > ___ > > Asterisk-Users mailing list > > [EMAIL PROTECTED] > > http://lists.digium.com/mailman/listinfo/asterisk-users > -- > Steven Critchfield <[EMAIL PROTECTED]> > > ___ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > > ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Modem => Serial ?
The problem with the few softmodem drivers I've dealt with is that parts of the driver are _NOT_ in source form. The parts that are in source form are basically a serial interface to the dsp library that does direct hardware access as it would have kernel level privs from having been called from inside the kernel. I'm interested in documenting a dsp library that is available for a software modem and seeing if it could be a resource for asterisk to create a modem interface. But this is a project probably for the fall/winter. On Wed, 2003-06-04 at 05:38, Dan wrote: > With a software modem, you cannot bypass AT commands and directly acces the > hardware for voice applications, as you have the source code for the modem > driver himself? > > BR, > Dan > > > > The problem is using the AT command set, not whether or not serial > > communications can carry voice. Remember that T1 is just a really fast > > serial line. > > > > The AT command set is a remnant of low power computing. You issue a > > command to get started with voice mode. Then you set it in record mode, > > and look to see if there is incoming audio. Then you issue a command to > > send audio when you have some in your queue. > > > ___ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users -- Steven Critchfield <[EMAIL PROTECTED]> ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Modem => Serial ?
With a software modem, you cannot bypass AT commands and directly acces the hardware for voice applications, as you have the source code for the modem driver himself? BR, Dan > The problem is using the AT command set, not whether or not serial > communications can carry voice. Remember that T1 is just a really fast > serial line. > > The AT command set is a remnant of low power computing. You issue a > command to get started with voice mode. Then you set it in record mode, > and look to see if there is incoming audio. Then you issue a command to > send audio when you have some in your queue. ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Modem => Serial ?
On Wed, 2003-06-04 at 01:49, Anthony Wood wrote: > On Wed, Jun 04, 2003 at 09:05:54AM +0300, Dan wrote: > > Hi, > > > > Serial voice modems use separate jacks for audio in and audio out. > > The audio stream cannot be passed through the serial line. > > Actually Dan, you are mistaken here, many serial fax/data/voice modems > come with answering machine programs which tell the modem to > send the voice data through the serial line. Also the vgetty > program in linux does the same. The problem is using the AT command set, not whether or not serial communications can carry voice. Remember that T1 is just a really fast serial line. The AT command set is a remnant of low power computing. You issue a command to get started with voice mode. Then you set it in record mode, and look to see if there is incoming audio. Then you issue a command to send audio when you have some in your queue. > > > > - Original Message - > > From: "Gary" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Wednesday, June 04, 2003 7:17 AM > > Subject: [Asterisk-Users] Modem => Serial ? > > > > > > > Now with the usual discussion which arises with compatible internal > > > modems for FULL DUPLEX voice etc... > > > > > > It really makes me think (again) about serial communications > > > > > > Most external modems will now talk at 115k2 so maybe some will explain > > > when/what/how/etc of why a serial interface could NOT be developed ?? > > > > > > Gary > > > . > > > > > > > > > > > > ___ > > > Asterisk-Users mailing list > > > [EMAIL PROTECTED] > > > http://lists.digium.com/mailman/listinfo/asterisk-users > > > > > > > > > > ___ > > Asterisk-Users mailing list > > [EMAIL PROTECTED] > > http://lists.digium.com/mailman/listinfo/asterisk-users -- Steven Critchfield <[EMAIL PROTECTED]> ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Modem => Serial ?
On Wed, Jun 04, 2003 at 09:05:54AM +0300, Dan wrote: > Hi, > > Serial voice modems use separate jacks for audio in and audio out. > The audio stream cannot be passed through the serial line. Actually Dan, you are mistaken here, many serial fax/data/voice modems come with answering machine programs which tell the modem to send the voice data through the serial line. Also the vgetty program in linux does the same. cheers, Woody > > BR, > Dan > > - Original Message - > From: "Gary" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Wednesday, June 04, 2003 7:17 AM > Subject: [Asterisk-Users] Modem => Serial ? > > > > Now with the usual discussion which arises with compatible internal > > modems for FULL DUPLEX voice etc... > > > > It really makes me think (again) about serial communications > > > > Most external modems will now talk at 115k2 so maybe some will explain > > when/what/how/etc of why a serial interface could NOT be developed ?? > > > > Gary > > . > > > > > > > > ___ > > Asterisk-Users mailing list > > [EMAIL PROTECTED] > > http://lists.digium.com/mailman/listinfo/asterisk-users > > > > > > ___ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users -- Woody ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Modem => Serial ?
Hi, Serial voice modems use separate jacks for audio in and audio out. The audio stream cannot be passed through the serial line. BR, Dan - Original Message - From: "Gary" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, June 04, 2003 7:17 AM Subject: [Asterisk-Users] Modem => Serial ? > Now with the usual discussion which arises with compatible internal > modems for FULL DUPLEX voice etc... > > It really makes me think (again) about serial communications > > Most external modems will now talk at 115k2 so maybe some will explain > when/what/how/etc of why a serial interface could NOT be developed ?? > > Gary > . > > > > ___ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > > ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
[Asterisk-Users] Modem => Serial ?
Now with the usual discussion which arises with compatible internal modems for FULL DUPLEX voice etc... It really makes me think (again) about serial communications Most external modems will now talk at 115k2 so maybe some will explain when/what/how/etc of why a serial interface could NOT be developed ?? Gary . ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
