Clicking on PSTN calls only when placing call on hold/taking off hold

Hey all,
We have an ongoing issue that we thought was isolated to a call flow going to our UCCX, but after extensive troubleshooting, have found that it is occuring when a PSTN caller is being placed on hold by or being taken off of hold (most noticeable when taking off of hold) either via an IP Phone or another system (Unity Connection when releasing to switch is transferring outside of Unity Connection, UCCX and it's hold/unhold steps). If we mirror this call flow, only calling from an IP Phone to Another and being placed on hold, or including Unity Connection or UCCX in the call flow, this doesn't occur. We've been working with TAC and our ITSP for the past couple weeks but haven't really made much traction. Wireshark traces on the CUBE, so far, only have the audible noise on the ITSP facing interface of the CUBE, which is what I would expect given that it's not heard internally.
Call flow:
PSTN Caller -> ITSP via SIP -> CUBE -> SIP -> CUCM -> IP Phone
CUCM Version 8.5.1.15900-4
CUBE Version 15.1(3)T2
MOH and CUBE have a G711 region relationship. Most IP Phones and systems have a G729 relationship, but as a test I put a phone in my G711 test region and the issue still occurs.
The traces show the call being setup with G729 (preference on my dial-peer), but the stream is all G711 (audio from my IP Phone and MOH). This was verified both in the trace and via the CUBE when doing a "show sip calls <my cell phone number>" that both legs were G711 and the issue was still occuring.
We regularly restart the IPVMS service as our MOH changes from time to time, but again this is only happening on PSTN calls, so my focus at this time has been the CUBE.
Has anyone run into this before? Perhaps it's a bug and I need to update my CUBE's firmware?

Hi,
Did you enable “Play music on hold”?
If yes, you can try to disable it and then test again.
Please also check if there are any error message on FE Server when the issue happen.
Please also update to the latest version for Lync Server 2013 and have a test.
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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