[cisco-voip] Can't use Telstralink conferencing service - DTMF tone duration?

[Robert Kulagowski]

Jonathan Charles wrote:
> Nothing interesting there.
> 
> Okay, so you have IP phones that are setup to use G.729 over the WAN... 
> I presume they use G.711 over the LAN, so why don't we disable 
> dtmf-relay, use in-band and see what happens.
> 
> Realistically, my thinking is that there is some incompatibility between 
> PRIs and the site you are calling...

Yes, the phone are using G.711u when sending a call out (pressing ? 
twice when listening to the nice young man from Telstralink telling me 
to enter my PIN.)

I'm opening a TAC case to see what they think about it.