[VoiceOps] FAX over VOIP networks

[Owen Roth]

We're on a large install of Adtran TA900s here, and we've had good 
successes with g711u with no T.38 option with low/no jitter, but are 
moving over to T.38. In the lab, at least, T.38 works great, once we 
divert our FoIP traffic to an Adtran end-point so that we can avoid our 
Cisco-Tekelec interoperability issues.

-Owen

Scott Berkman wrote:
>
> Agreed.
>
>  
>
> The key really is g.711 (usually u-law) and low (read no) 
> latency/jitter unless you can fully interop T.38 across the network.  
> Most fax machines will auto-negotiate to the lower speeds when needed, 
> but low to middle end Brother machines may be a major exception as 
> they often have a poor T.30 implementation.
>
>  
>
>                 -Scott
>
>  
>
> *From:* voiceops-bounces at voiceops.org 
> [mailto:voiceops-bounces at voiceops.org] *On Behalf Of *Kenny Sallee
> *Sent:* Friday, August 28, 2009 12:06 PM
> *To:* voiceops at voiceops.org
> *Subject:* [VoiceOps] FAX over VOIP networks
>
>  
>
> So the last thread on T38 made me want to start a thread on FAX over 
> IP via an ATA or something like the Adtran TA900 series.
>
>  
>
> From our experience, to be most successful w/ FAX over IP of any sort 
> we've found that if you:
>
>  
>
> 1.) Set baud to lowest setting fax can handle
>
> 2.) Lower print quality settings if possible
>
> 3.) Make sure to force G711
>
> 4.) Disable ECM and VAD on fax/modem tone detection
>
>  
>
> And then cross your fingers fax's are successful and consistent. 
>  Anyone else have other experiences or suggestions?
>
> Kenny
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> VoiceOps mailing list
> VoiceOps at voiceops.org
> https://puck.nether.net/mailman/listinfo/voiceops
>   

-- 
Owen Roth
Network Engineer, CCNP
Impulse Internet Services
http://impulse.net/customer-support
mailto:owen at impulse.net
Tech Support: 805-456-5800
w: 805-884-6332