I've got about 50 VTAs and about 20 Tandberg MXP endpoints with CUCM 7.1.3. The Tandberg endpoints are registered as H.323 client in CUCM and I can dial by 4-digit extension between VTA and Tandberg. My issue is for some reason for calls between VTA and Tandberg it takes longer for the VTA to see the far end and sometimes the far end doesn't show up at all on the VTA but if I hang up the call and then reconnect then the call connects normally with video on both ends immediately. The issue seems to only happen for calls between VTA and Tandberg. Has anyone ran into this issue ?
Thanks in advance for any inputs / suggestions !!!