mscSigChanEIsdnCircuitSwitchedK 1.3.6.1.4.1.562.36.2.1.115.14.11.1.6

This attribute specifies the maximum number of sequentially numbered I frames (that is, window size (k)) that may be unacknowledged at any given time for a SAP supporting primary rate (64kbit/sec) signalling.