We have a customer site that is having some issues with their IVR system. The system worked without any issues for a couple of months. We had to change the gateway from H.323 to MGCP because of a caller ID issue. As soon as we made the change to MGCP, the IVR system started periodically receiving duplicate digits when a customer dials in their account number. The IVR system is connected to the IPT network via ATAs. Weve replaced ATAs, but the problem persists. Weve tried several different dtmf-relay commands, still does the same thing. A TAC case was opened and debugs sent to Cisco. TAC says the ATAs arent sending any dialed digits twice.
My question is, why would this break after changing the gateway router from H.323 to MGCP????
The gateway is connected to the PSTN via a PRI.
Any help given would be greatly appreciated!
We're running into a similair issue and TAC DE is currently testing a fix, you should open a TAC case to confirm.
(CSCsc19202 Bug Details
Symptoms : DTMF digits may not get recognized by your IVR system. If you
listen carefully for the
DTMF tone that is sent by gw, you may hear doubl sound.
Condition : GW is a MGCP gw which has configured with mgcp dtmf-relay voip
codec all mode out-of-
band or no mgcp dtmf voip, and codec g711u is used.
Workaround : Use codec g729 to make the in band dtmf unrecognizable.)