Re: [hylafax-users] Erratic DTMF / DID information

[Lee Howard <lee.howard@xxxxxxxxxxxx>]

Darren Nickerson wrote:
> On May 8, 2008, at 3:56 PM, Lee Howard wrote:
>
> > Cannon, Greg wrote:
> > > We have set up everything for fax routing based on inbound number 
> > > called.  The call goes through our Avaya IP Office PBX,  The DID 
> > > information is sent to the modem via DTMF and picked up by HylaFAX 
> > > as callerID information and routed to the proper mailbox.
> > >
> > > The problem is the callid0 value is right about 85% of the time.  
> > > The other 15% of the time, instead of getting 4344, I am getting: 
> > > 444, 34, 44, 434, 344 or 43.  This doesn't appear to be effected by 
> > > "<delay:100>" in the device's config file.
> > >
> > > I know this is the Enterprise version of HylaFAX and I fully expect 
> > > to contact the ifax guys with this, but first I wanted to run it 
> > > through here in case someone has seen it before and knew it to be a 
> > > modem firmware issue, a configuration issue in IP Office, timing or 
> > > even could suggest ways to narrow it down.
> > >
> > > Server version: HylaFAX Enterprise Version 2.4.3 (hylafax-enterprise 
> > > 2.4.3-1rhel4)
> > > OS: CentOS 4.6
> > > Kernel: 2.6.9-67.0.7.ELSmp
> > > Modem: RockForce Quatro+ board Rev 1.2
> >
> > To the best of my knowledge there are no known cases where DTMF 
> > detection is failing at all on the RockForce QUATRO+ Rev. 1.2 fax 
> > boards.
>
> We've seen this before, several times in fact and specifically with 
> Mainpine boards. If I recall correctly our solution has been to tune 
> the duration and intra-digit timing of the DTMF tones at the PBX 
> level. This often causes digits to be doubled up (44334444) instead of 
> lost, but not all digits were doubled all the time so there was some 
> post-processing in FaxDispatch involved to get us back to 4 digits.
>
> Right now it seems like you're losing digits ... the Avaya must be 
> hitting on some built-in threshold in mainpine's DTMF detection. 
> Hopefully you can tune the Avaya.

Our recommendation is for a 100 ms inter-digit delay and a 100 ms digit 
duration ... if that's configurable on the PBX.

Thanks,

Lee.

--
*Lee Howard*
*Mainpine, Inc. Support Manager*
Tel: +1 866 363 6680 ext 4 | Fax: +1 360 462 8160
lee.howard@xxxxxxxxxxxx | www.mainpine.com


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