We ran into this problem on a client segment that is rather busy, and Cisco TAC identified that the ‘rtr’ buffer is too small on the call router so we are changing “rtr buffer limit” to 4096 by regedit.exe.Note that you should check with TAC before ...

We check this regularly for the clients where we provide ICM routing service.To check this look in: router log viewer, the error message is "all labels in use"Hope this helps.Kelly Eric FrigstadAT&T Canada