[VoiceOps] Dynamic T1 Faxing over IP

Todd Wolf twolf at voipnettechnologies.com
Wed Dec 15 18:00:48 EST 2010

Fax never works well over IP but if you have the customer reduce the fax
machine's baud rate to 9600 (if capable) it has more consistent
results....we always propose our desktop fax solution as a replacement
or have them keep it as a POTS line to be shared with alarm/modem/cr
card/fax...this also gives them a disaster line in the event of no IP or
power, they can plug in any old SLT phone to make an emergency call.







Todd Wolf
President / COO 







twolf at voipnettechnologies.com









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From: voiceops-bounces at voiceops.org
[mailto:voiceops-bounces at voiceops.org] On Behalf Of Jeff Anderson
Sent: Wednesday, December 15, 2010 5:54 PM
To: voiceops at voiceops.org
Subject: [VoiceOps] Dynamic T1 Faxing over IP


We are experiencing a fair amount of heart burn attempting to support
faxing over our Dynamic T1 product. Some customers it works great and
others have frequent problems.

We currently support dynamic T1's using both Adtran TA900 series and
Cisco IAD2400 services routers. The customers fax machines will connect
to their PBX that has a PRI to an IAD/TA. We have the IAD/TA configured
for SIP signaling to an Acme SBC selecting T.38 as the preferred codec
with fallback to g.711 pass-through. We can force a slower speed,
disable error correction, disabled VAD but in the end still have very
inconsistent results. From a network perspective the QoS is matching and
queuing correctly, the circuits are clean and the IP SLA gives us no
reason to believe they are having any network drops or jitter.

I was wondering if others who have experience with faxing over IP could
share what they have learned works best or anything else that may be

Any help is greatly appreciated.



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