First call attempt fails with 12000; reason="Routes available for this request but no available gateway at this point"

We've installed a new Audiocodes Mediant 1000B gateway for our customer.  They only have about 6 users enabled for Enterprise voice and using Lync for all calls.  They have an intermittent problem whereby the first call attempt to a number on the
PSTN fails with 12000; reason="Routes available for this request but no available gateway at this point".  There is only one PSTN gateway installed.  All routes point to this gateway.  What I found initially is that the calls
were failing after 10 seconds which is the default "failovertimeout" in the OutboundRouting.exe.config.  I found this post http://voipnorm.blogspot.co.uk/2012/06/lync-2010-gateway-timeout-call-failures.html and
changed the value to 20 seconds.  Subsequent failures failed after 20 seconds (the new value).  The interesting thing is that the second attempt even a couple of seconds later succeeds.  My Lync server event log has 46046 "A call to a PSTN
number failed due to non availability of gateways." for the failed call and 46047 "A PBX gateway is now responding to requests after some failures." for the successful call moments later.
My environment is Lync 2010.  A single enterprise edition Front End with collocated mediation.  The server is virtual and in a different physical location to the gateway.  The two sites are connected via a LES1000.  The RTT between the
sites is very low so it isn't necessarily networking.
In the Syslog output on the Audiocodes we don't see the call even reach the gateway.  It's likely that Lync has simply marked the gateway as down and doesn't route the first call.  Then it wakes up and marks it as up and routes the next call.
Update wise I'm on 4.0.7577.183, 199 and 217 for those that are up to date and the only components that are behind say that 223 is available.  Those being Core Components, Lync Server, Conferencing Server and Web Components.
As I said, this is intermittent, apparently doesn't happen for every user (which I don't buy), but is easily replicated on request.
I definitely think changing the failovertimeout value has reduced the number of failures.  But realistically I don't want users sitting there for 20 seconds before their call fails.  Or 19 seconds for the call to route.
I've found a few posts on this and similar issues.  I don't get the 25051 or 25052 errors.
Any help gratefully appreciated.
Regards
Randy Chapman
Best Regards Randy Chapman

Try to change the value of Failovertimeout to 1000.
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