[cisco-voip] IOS version for t.38?

[Christopher]

Hello...

Summary: I am trying to implement t.38 for receiving faxes.  It doesn't
work and I suspect the IOS version I am using.  What is a "known good
version" for t.38?

Details:
   2821 router
   Version 12.4(15)T5  #   T train
     c2800nm-advipservicesk9-mz.124-15.T5.bin
   PRI incoming (2)
   GigE to local Call Manager servers
   4 Voice FXS interfaces
  
One site, everything is local on a GigE network.  The phones all work.
Normal Faxes via FXS to a Hylafax server work.


If I call the phone number I am sending to the t38 modem, I do get a fax
tone.  However, when using a real fax machine, the error on the
receiving side is:  "Failure to receive silence (synchronization
failure)."  Tested (and every fax call failed) using t38modem on both
FreeBSD 6.3 and Linux (ubuntu).  When I use two t38 modems to "call"
each other I can connect fine.   

I have googled and searched the cisco site and everything I read points
to me doing everything correctly.


dial-peer voice 489 voip
 description To VoIP fax
 destination-pattern 489
 session target ipv4:xx.yy.zz.20
 codec g711ulaw
 fax-relay ecm disable  # tried with and without
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback none
 no vad



Any ideas?



-- 
Christopher McCrory
 <chrismcc at pricegrabber.com>

To the optimist, the glass is half full.
To the pessimist, the glass is half empty.
To the engineer, the glass is twice as big as it needs to be.