[VoiceOps] Dynamic T1 Faxing over IP

Richey mylists at battleop.com
Wed Dec 15 22:53:00 EST 2010

The TA900s and 2431s will handle faxing, alarms, modems, etc fine IF you do
two things.  One you use point to point circuits between you and the IAD.
The other thing is avoid sending these accounts across sip trunks that
traverse the internet.   We use a combination of PRIs for local and SIP
trunks for LD.  We route the "data lines" so that their local and ld go out
their closest PRI.    If the customer wants to bring their own bandwidth or
they are offnet we won't support any kind of data calls.




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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