HI David
We just implemented a solution like this.
Environment CUCM A 10.5
CUCM B HCS
Recording server AQM 9.5
User A profile on CUCM A login to Phone B on CUCM B and the recording need to be recorded on CUCM A side.
We check on the RTMT logs the phone actually sent invite to AQM server but it turn back with 404 not found.
What we do is manually import the phone B mac address on AQM server and stop the AXL syn on AQM server. Because the consistently syn from AQM and CUCM will clean out any phone or profile that could not be found on CUCM. If we stop the syn the phone will stay on AQM. After that we test the recording it works like chime!
Regards
Jasper