Hi All, I'll try and keep this simple. We are experiencing difficulty transmitting fax with a certain UK provider (BT) who have suggested the fix for the fault is that we "*should fall back to using G711 pass through in order to negotiate/ send fax*" The call initially connects with G711 (and the media is proxied). Fax is detected by the originator which issues a RE-INVITE request to use T38. This is rejected by the gateway with a 488 at which point we would expect the call to fall back to G711 however FreeSWITCH is reporting that this is not possible due to a media bug: "*Session is connected to a media bug. Re-Negotiation implicitly disabled.*" My understanding was that a media bug would be required for the initial fax tone detection which subsequently triggers the T38 session start? Could anyone confirm whether we need to be looking into closing off the media bug manually or if there is an alternative route to resolving this issue? We are running FreeSWITCH (Version 1.4.26 64bit). Calls are dispatched with setting "t38_passthru=true". Any help would be very much welcomed. Best Regards, Callum -- Callum Guy Head of Information Security X-on -- *0333 332 0000 | www.x-on.co.uk <http://www.x-on.co.uk> | ** <https://www.linkedin.com/company/x-on> <https://www.facebook.com/XonTel> <https://twitter.com/xonuk> * X-on is a trading name of Storacall Technology Ltd a limited company registered in England and Wales. Registered Office : Avaland House, 110 London Road, Apsley, Hemel Hempstead, Herts, HP3 9SD. Company Registration No. 2578478. The information in this e-mail is confidential and for use by the addressee(s) only. If you are not the intended recipient, please notify X-on immediately on +44(0)333 332 0000 and delete the message from your computer. If you are not a named addressee you must not use, disclose, disseminate, distribute, copy, print or reply to this email. Views or opinions expressed by an individual within this email may not necessarily reflect the views of X-on or its associated companies. Although X-on routinely screens for viruses, addressees should scan this email and any attachments for viruses. X-on makes no representation or warranty as to the absence of viruses in this email or any attachments.
I had a same question: http://thread.gmane.org/gmane.comp.telephony.freeswitch.user/86263 Sorry google lead me only to this link... On Dec 7, 2017 18:06, "Callum Guy" <callum.guy@x-on.co.uk> wrote:
Hi All,
I'll try and keep this simple.
We are experiencing difficulty transmitting fax with a certain UK provider (BT) who have suggested the fix for the fault is that we "*should fall back to using G711 pass through in order to negotiate/ send fax*"
The call initially connects with G711 (and the media is proxied). Fax is detected by the originator which issues a RE-INVITE request to use T38. This is rejected by the gateway with a 488 at which point we would expect the call to fall back to G711 however FreeSWITCH is reporting that this is not possible due to a media bug:
"*Session is connected to a media bug. Re-Negotiation implicitly disabled.*"
My understanding was that a media bug would be required for the initial fax tone detection which subsequently triggers the T38 session start? Could anyone confirm whether we need to be looking into closing off the media bug manually or if there is an alternative route to resolving this issue?
We are running FreeSWITCH (Version 1.4.26 64bit). Calls are dispatched with setting "t38_passthru=true".
Any help would be very much welcomed.
Best Regards,
Callum -- Callum Guy Head of Information Security X-on
*0333 332 0000 | www.x-on.co.uk <http://www.x-on.co.uk> | ** <https://www.linkedin.com/company/x-on> <https://www.facebook.com/XonTel> <https://twitter.com/xonuk> * X-on is a trading name of Storacall Technology Ltd a limited company registered in England and Wales. Registered Office : Avaland House, 110 London Road, Apsley, Hemel Hempstead, Herts, HP3 9SD. Company Registration No. 2578478. The information in this e-mail is confidential and for use by the addressee(s) only. If you are not the intended recipient, please notify X-on immediately on +44(0)333 332 0000 <+44%20333%20332%200000> and delete the message from your computer. If you are not a named addressee you must not use, disclose, disseminate, distribute, copy, print or reply to this email. Views or opinions expressed by an individual within this email may not necessarily reflect the views of X-on or its associated companies. Although X-on routinely screens for viruses, addressees should scan this email and any attachments for viruses. X-on makes no representation or warranty as to the absence of viruses in this email or any attachments.
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
Hi, media proxy mode is not willing to work fine with fax t38, since `t38_passthru=true` dont have any effect in that mode. Could consider getting away from media proxy mode since it's not recommended anymore by FS's developers. Btw, you may want to upgrade your FS to 1.6.15 or later. http://lists.freeswitch.org/pipermail/freeswitch-users/2017-January/124459.h... rgds, Loi Dang On Fri, Dec 8, 2017 at 1:55 AM Mirko Brankovic <mirkobrankovic@gmail.com> wrote:
I had a same question: http://thread.gmane.org/gmane.comp.telephony.freeswitch.user/86263 Sorry google lead me only to this link...
On Dec 7, 2017 18:06, "Callum Guy" <callum.guy@x-on.co.uk> wrote:
Hi All,
I'll try and keep this simple.
We are experiencing difficulty transmitting fax with a certain UK provider (BT) who have suggested the fix for the fault is that we "*should fall back to using G711 pass through in order to negotiate/ send fax*"
The call initially connects with G711 (and the media is proxied). Fax is detected by the originator which issues a RE-INVITE request to use T38. This is rejected by the gateway with a 488 at which point we would expect the call to fall back to G711 however FreeSWITCH is reporting that this is not possible due to a media bug:
"*Session is connected to a media bug. Re-Negotiation implicitly disabled.*"
My understanding was that a media bug would be required for the initial fax tone detection which subsequently triggers the T38 session start? Could anyone confirm whether we need to be looking into closing off the media bug manually or if there is an alternative route to resolving this issue?
We are running FreeSWITCH (Version 1.4.26 64bit). Calls are dispatched with setting "t38_passthru=true".
Any help would be very much welcomed.
Best Regards,
Callum -- Callum Guy Head of Information Security X-on
*0333 332 0000 | www.x-on.co.uk <http://www.x-on.co.uk> | ** <https://www.linkedin.com/company/x-on> <https://www.facebook.com/XonTel> <https://twitter.com/xonuk> * X-on is a trading name of Storacall Technology Ltd a limited company registered in England and Wales. Registered Office : Avaland House, 110 London Road, Apsley, Hemel Hempstead, Herts, HP3 9SD. Company Registration No. 2578478. The information in this e-mail is confidential and for use by the addressee(s) only. If you are not the intended recipient, please notify X-on immediately on +44(0)333 332 0000 <+44%20333%20332%200000> and delete the message from your computer. If you are not a named addressee you must not use, disclose, disseminate, distribute, copy, print or reply to this email. Views or opinions expressed by an individual within this email may not necessarily reflect the views of X-on or its associated companies. Although X-on routinely screens for viruses, addressees should scan this email and any attachments for viruses. X-on makes no representation or warranty as to the absence of viruses in this email or any attachments.
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
Mirko, Loi, Thanks for your responses. I really wanted to check if there was anything obvious which our platform was not handling properly however your responses help to confirm that Fax/FOIP is rarely plain sailing. I had actually found Mirko's email thread before writing this - Brian's response was helpfully discouraging! I'm not clear on whether it will be possible to remove the media proxy from the call path on this occasion but it is something I'll look into. I will also look into finding resource to test on the latest stable release and see if the recent modifications are resolving this situation. Once those avenues are exhausted I'll get on with the day job! If anyone does have other suggestions then please do get in touch. Thanks again, Callum *NB. When was the last time you got a fax?!?* On Fri, Dec 8, 2017 at 4:36 AM Lợi Đặng <loi.dangthanh@gmail.com> wrote:
Hi, media proxy mode is not willing to work fine with fax t38, since `t38_passthru=true` dont have any effect in that mode. Could consider getting away from media proxy mode since it's not recommended anymore by FS's developers. Btw, you may want to upgrade your FS to 1.6.15 or later.
http://lists.freeswitch.org/pipermail/freeswitch-users/2017-January/124459.h...
rgds, Loi Dang
On Fri, Dec 8, 2017 at 1:55 AM Mirko Brankovic <mirkobrankovic@gmail.com> wrote:
I had a same question: http://thread.gmane.org/gmane.comp.telephony.freeswitch.user/86263 Sorry google lead me only to this link...
On Dec 7, 2017 18:06, "Callum Guy" <callum.guy@x-on.co.uk> wrote:
Hi All,
I'll try and keep this simple.
We are experiencing difficulty transmitting fax with a certain UK provider (BT) who have suggested the fix for the fault is that we "*should fall back to using G711 pass through in order to negotiate/ send fax*"
The call initially connects with G711 (and the media is proxied). Fax is detected by the originator which issues a RE-INVITE request to use T38. This is rejected by the gateway with a 488 at which point we would expect the call to fall back to G711 however FreeSWITCH is reporting that this is not possible due to a media bug:
"*Session is connected to a media bug. Re-Negotiation implicitly disabled.*"
My understanding was that a media bug would be required for the initial fax tone detection which subsequently triggers the T38 session start? Could anyone confirm whether we need to be looking into closing off the media bug manually or if there is an alternative route to resolving this issue?
We are running FreeSWITCH (Version 1.4.26 64bit). Calls are dispatched with setting "t38_passthru=true".
Any help would be very much welcomed.
Best Regards,
Callum -- Callum Guy Head of Information Security X-on
*0333 332 0000 | www.x-on.co.uk <http://www.x-on.co.uk> | ** <https://www.linkedin.com/company/x-on> <https://www.facebook.com/XonTel> <https://twitter.com/xonuk> * X-on is a trading name of Storacall Technology Ltd a limited company registered in England and Wales. Registered Office : Avaland House, 110 London Road, Apsley, Hemel Hempstead, Herts, HP3 9SD. Company Registration No. 2578478. The information in this e-mail is confidential and for use by the addressee(s) only. If you are not the intended recipient, please notify X-on immediately on +44(0)333 332 0000 <+44%20333%20332%200000> and delete the message from your computer. If you are not a named addressee you must not use, disclose, disseminate, distribute, copy, print or reply to this email. Views or opinions expressed by an individual within this email may not necessarily reflect the views of X-on or its associated companies. Although X-on routinely screens for viruses, addressees should scan this email and any attachments for viruses. X-on makes no representation or warranty as to the absence of viruses in this email or any attachments.
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
-- Callum Guy Head of Information Security X-on -- *0333 332 0000 | www.x-on.co.uk <http://www.x-on.co.uk> | ** <https://www.linkedin.com/company/x-on> <https://www.facebook.com/XonTel> <https://twitter.com/xonuk> * X-on is a trading name of Storacall Technology Ltd a limited company registered in England and Wales. Registered Office : Avaland House, 110 London Road, Apsley, Hemel Hempstead, Herts, HP3 9SD. Company Registration No. 2578478. The information in this e-mail is confidential and for use by the addressee(s) only. If you are not the intended recipient, please notify X-on immediately on +44(0)333 332 0000 and delete the message from your computer. If you are not a named addressee you must not use, disclose, disseminate, distribute, copy, print or reply to this email. Views or opinions expressed by an individual within this email may not necessarily reflect the views of X-on or its associated companies. Although X-on routinely screens for viruses, addressees should scan this email and any attachments for viruses. X-on makes no representation or warranty as to the absence of viruses in this email or any attachments.
*NB. When was the last time you got a fax?!?*
*Good one :D* On Fri, Dec 8, 2017 at 10:00 AM, Callum Guy <callum.guy@x-on.co.uk> wrote:
Mirko, Loi,
Thanks for your responses. I really wanted to check if there was anything obvious which our platform was not handling properly however your responses help to confirm that Fax/FOIP is rarely plain sailing. I had actually found Mirko's email thread before writing this - Brian's response was helpfully discouraging!
I'm not clear on whether it will be possible to remove the media proxy from the call path on this occasion but it is something I'll look into.
I will also look into finding resource to test on the latest stable release and see if the recent modifications are resolving this situation.
Once those avenues are exhausted I'll get on with the day job! If anyone does have other suggestions then please do get in touch.
Thanks again,
Callum
*NB. When was the last time you got a fax?!?*
On Fri, Dec 8, 2017 at 4:36 AM Lợi Đặng <loi.dangthanh@gmail.com> wrote:
Hi, media proxy mode is not willing to work fine with fax t38, since `t38_passthru=true` dont have any effect in that mode. Could consider getting away from media proxy mode since it's not recommended anymore by FS's developers. Btw, you may want to upgrade your FS to 1.6.15 or later. http://lists.freeswitch.org/pipermail/freeswitch-users/ 2017-January/124459.html
rgds, Loi Dang
On Fri, Dec 8, 2017 at 1:55 AM Mirko Brankovic <mirkobrankovic@gmail.com> wrote:
I had a same question: http://thread.gmane.org/gmane.comp.telephony.freeswitch.user/86263 Sorry google lead me only to this link...
On Dec 7, 2017 18:06, "Callum Guy" <callum.guy@x-on.co.uk> wrote:
Hi All,
I'll try and keep this simple.
We are experiencing difficulty transmitting fax with a certain UK provider (BT) who have suggested the fix for the fault is that we "*should fall back to using G711 pass through in order to negotiate/ send fax*"
The call initially connects with G711 (and the media is proxied). Fax is detected by the originator which issues a RE-INVITE request to use T38. This is rejected by the gateway with a 488 at which point we would expect the call to fall back to G711 however FreeSWITCH is reporting that this is not possible due to a media bug:
"*Session is connected to a media bug. Re-Negotiation implicitly disabled.*"
My understanding was that a media bug would be required for the initial fax tone detection which subsequently triggers the T38 session start? Could anyone confirm whether we need to be looking into closing off the media bug manually or if there is an alternative route to resolving this issue?
We are running FreeSWITCH (Version 1.4.26 64bit). Calls are dispatched with setting "t38_passthru=true".
Any help would be very much welcomed.
Best Regards,
Callum -- Callum Guy Head of Information Security X-on
*0333 332 0000 | www.x-on.co.uk <http://www.x-on.co.uk> | ** <https://www.linkedin.com/company/x-on> <https://www.facebook.com/XonTel> <https://twitter.com/xonuk> * X-on is a trading name of Storacall Technology Ltd a limited company registered in England and Wales. Registered Office : Avaland House, 110 London Road, Apsley, Hemel Hempstead, Herts, HP3 9SD. Company Registration No. 2578478. The information in this e-mail is confidential and for use by the addressee(s) only. If you are not the intended recipient, please notify X-on immediately on +44(0)333 332 0000 <+44%20333%20332%200000> and delete the message from your computer. If you are not a named addressee you must not use, disclose, disseminate, distribute, copy, print or reply to this email. Views or opinions expressed by an individual within this email may not necessarily reflect the views of X-on or its associated companies. Although X-on routinely screens for viruses, addressees should scan this email and any attachments for viruses. X-on makes no representation or warranty as to the absence of viruses in this email or any attachments.
____________________________________________________________ _____________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/ options/freeswitch-users http://www.freeswitch.org
____________________________________________________________ _____________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
-- Callum Guy Head of Information Security X-on
*0333 332 0000 | www.x-on.co.uk <http://www.x-on.co.uk> | ** <https://www.linkedin.com/company/x-on> <https://www.facebook.com/XonTel> <https://twitter.com/xonuk> * X-on is a trading name of Storacall Technology Ltd a limited company registered in England and Wales. Registered Office : Avaland House, 110 London Road, Apsley, Hemel Hempstead, Herts, HP3 9SD. Company Registration No. 2578478. The information in this e-mail is confidential and for use by the addressee(s) only. If you are not the intended recipient, please notify X-on immediately on +44(0)333 332 0000 <+44%20333%20332%200000> and delete the message from your computer. If you are not a named addressee you must not use, disclose, disseminate, distribute, copy, print or reply to this email. Views or opinions expressed by an individual within this email may not necessarily reflect the views of X-on or its associated companies. Although X-on routinely screens for viruses, addressees should scan this email and any attachments for viruses. X-on makes no representation or warranty as to the absence of viruses in this email or any attachments.
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
-- Regards, Mirko
participants (3)
-
Callum Guy
-
Lợi Đặng
-
Mirko Brankovic