[cisco-voip] SIP to PRI transcoding

[Blake Pfankuch - Mailing List]

They do, however we are running into upstream from them not fully supporting T.38.  So we do T.38 through our provider’s network, but when it hands off to other carriers we have about 15% not supporting T.38 properly.

Thanks,
Blake

From: James Buchanan [mailto:james.buchanan2 at gmail.com]
Sent: Monday, May 19, 2014 11:07 PM
To: Blake Pfankuch - Mailing List
Cc: Cisco VOIP (cisco-voip at puck.nether.net)
Subject: Re: [cisco-voip] SIP to PRI transcoding

Does your carrier support T.38 over SIP? If not, you might want to change SIP carriers.

On Tue, May 20, 2014 at 3:19 AM, Blake Pfankuch - Mailing List <blake.mailinglist at pfankuch.me<mailto:blake.mailinglist at pfankuch.me>> wrote:
I am working with a faxing system that is giving me more nightmares than I can even count…  I am working with a software system that sends FoIP using T.38 and V.17 faxing.  It does not support G711 fallback, and that has been giving us fits like you would not believe our upstream carrier.  The specific issue lies in paths which do not support T.38 and are trying to do G711 fallback.  I have a pair of 3825 router configured as UBE’s in an HSRP configuration.

I am looking to mitigate some of these issues by implementing a couple of TDM PRI’s (one to each device).  These PRI’s will be configured in an active/passive failover group from the carrier side uplinked into the existing 3825 UBE’s.

My question is on the conversion as I have never done this before.  I know this will pull a DSP (or a couple) for each transcoding session, so I have 8 PVDM 64’s I am going to throw in these routers.  I still need to be able to support SIP in case of a PRI failure as both PRI’s come in on the same channelized DS3.

Has anyone had to do this before?  Specifically with T.38.  Had good luck with it or should I look towards the solution I planned for next year which was a pair of ASR1001 routers to act as SBC’s and handle these functions.

Thanks in Advance,
Blake

_______________________________________________
cisco-voip mailing list
cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
https://puck.nether.net/mailman/listinfo/cisco-voip

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20140520/5adc806a/attachment.html>