Symptom:
In some circumstances, a large number of Error messages are printed to the TelePresence Server event log of the form:

DSP_MANAGER : Error : DSP xxxx, object 00000000: DSP xxxx
vs_surface store alloc n failures in last five seconds

Conditions:
This error is caused when the TelePresence Server runs out of internal encoder objects for a specific participant. This is most likely to occur in a ClearPath call where a large number of reference frames have been requested for use with packet loss resilience. Alternatively it can occur when a low framerate/quality extended video encoder is connected to a new participant.