I am getting mix reports of users with 7900 series phones that call an outside auto attendant (not unity, another business over PSTN) and are unable to navigate the DTMF menu. For example if they punch 2 for english they get an "invalid response". The odd thing is that this is not always recreate-able. It does seem to happen to the same users when it does happen.
The most recent report are 7921 and 7971 users that use an MGCP gateway (digital PRI) to connect to the PSTN. I have "MGCP DTMF-Relay voip mode all codec out-of band" specified on the gateway as well. Not sure what could be impacting DTMF.
Thanks for the idea, but this didn't change anything. The users that are local to the PRI gateway are not able to navigate outside menus, but remote users that are using that same PRI gateway through Tail end hop off are able to use DTMF in the menu system. The difference would be what codec was in use G.711ulaw/G.728r8 respectively.
The firmware bug was indeed my problem. I backed the phones down to 8.3.4sr1 and this resolved the issue. FYI the 8.4.1S code is part of the cmterm-devicepack18.104.22.1683-2.cop.sgn update that I had applied earlier for this particular customer. So use with caution.
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