"Maximum simultaneous call-legs reached" error with only three active calls.

[mctek]

We are receiving the following error semi-regularly on our 7100 when users try dialing internal or external numbers.

SIP.STACK ERROR  CALL CallLegMgrCreateCallLeg - cannot create a new call. Maximum simultaneous call-legs reached (330).

A reboot of the switch will resolve the issue but trying to avoid that. Anyone seen this?

[Anonymous]

We had this same error pop up on our Adtran 908e. Only difference was ours read as follows:

SIP.STACK ERROR  CALL CallLegMgrCreateCallLeg - cannot create a new call. Maximum simultaneous call-legs reached (200).

Does anyone know why this error comes up?