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

["Cannon, Greg" <GCannon@xxxxxxxxxxxxxxxxxx>]

Lee and Darren,

Thanks for all of the information.  It appears that the Avaya PBX is
using 80 ms DTMF mark and space... under the 100 ms recommendation by
Mainpine.  

This is almost certainly the issue.  We are looking into adjusting this
timing.

Thanks again,
Greg Cannon

-----Original Message-----
From: Lee Howard [mailto:lee.howard@xxxxxxxxxxxx] 
Sent: Thursday, May 08, 2008 4:40 PM
To: Cannon, Greg
Cc: hylafax-users@xxxxxxxxxxx
Subject: Re: [hylafax-users] Erratic DTMF / DID information


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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