An optical information recording medium is composed of at least a phase-change type recording layer 4 provided on a substrate 1. The optical information recording medium is conducted to record and erase information by changing a phase of the phase-change type recording layer by irradiating light. The phase-change type recording layer is further composed of Ti.sub.wGe.sub.xSb.sub.yTe.sub.z, wherein each of w, x, y and z is in atomic percent and satisfies following relations: 0.5.ltoreq.w.ltoreq.4.0, 3.4.ltoreq.x.ltoreq.14.5, 2.1.ltoreq.y/z.ltoreq.4.0 and w+x+y+z=100.

 
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> Method and apparatus for call setup latency reduction

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