Cisco callers are not hearing MOH if placed hold an avaya phone

[MplsSpice]

Hi Cisco callers are not hearing hold music if they are places on hold by an avaya user.
We have Cisco & Avaya they are 5 digit dial through CVP trucks that go through our 3825 router.
If Cisco places avaya on hold - Avaya hear MOH
If Avaya places avaya on hold - they hear MOH
If Cisco places cisco on hold - they hear MOH
If calls comes from the PSTN and is places on hold - they hear MOH.

Any suggestions to get this working???