Is it lost DTMF? Or one way audio?
Call the IVR internally and test for DTMF to make sure it isn’t your SIP trunk provider on the inbound route with the issue.
7777 has nothing to do with this internal test for DTMF.
Add New Virtual Extension > User Extension: 2468 > Display Name: 2468-Test > Advanced > No Answer: IVR, Busy: IVR, Not Reachable: IVR > Submit > Apply Config.
Call 2468 and test your IVR for DTMF.
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