[cisco-voip] DTMF failure after IOS upgrades

[STEVEN CASPER]

Just upgraded my 2821 gateway routers to 12.4-13b and users on Nortel
PBXs using 500 type sets can not log into Unity. Nortel digital sets are
ok. The Nortels are connected to the gateways via MGCP controlled QSIG
PRIs. If I downgrade code back to 12.4-3b or 3g the 500 sets can log
into with no problem. Any advice or troubleshooting tips would be
appreciated.

Thanks,

Steve Casper
Voice Technologies
M&T Bank
(410) 347-6026

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