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3.3.3.5.6 Dropping Packets for Old Calls

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If a server implementation receives a request PDU without the PFC_FIRST_FRAG flag and there is no active call for the connection, it SHOULD compare the call_id field from the PDU to the Current call_id on the Server Connection. If the call_id field is smaller by less than 150, the server SHOULD ignore the packet. If the call_id field is smaller by 150 or more, the server SHOULD treat this as a protocol error, as specified in section 3.3.3.5.7.<125>