I have G722 disabled ,i am also using the new Cisco Media driver ,so should be able to use G729 codec to CUEAC ,according to release notes ,using CUCM v 8.6. I am using H323 GW and dial-peer i have tried on G711 but same issue. So far it is only for external calls.
When you put a call on hold, the system basically transfers the call from the attendant phone to a CTI Port.
Check the logs on the server for any errors arising when this happens. It might be a problem with the reachability (i.e. CSS/Partition) setup.
I've also seen problems where the CTI Ports were assigned MRGLs with multicast MoH enabled - if that's the case try removing any MoH devices from the MRGL and ensuring all MoH devices are assigned to at least one MRG (i.e. so any mcast MoH sources are not left in the default pool).
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