step-by-step instructions for operating the OpenStage. Administrative tasks are dealt with in a separate manual. The Quick Reference Guide contains.This user guide is designed to be simple and easy to understand, providing clear step-by-step instructions for operating your OpenStage phone. Administrative GUIDE SIEMENS. OPENSTAGE. 15T HANDSETS. DIALLING OUT. To access an outside line simply dial 9. There are two different ways in which you can dial out:. This user guide is designed to be simple and easy to understand, providing clear step-by-step in- structions for operating your OpenStage phone. Administrative View and download the Manual of Siemens OpenStage 15 - Unify Office Phone (page 1 of 136) (English). numbers OpenStage 15OpenStage 15 T or procedures View and Download Siemens OpenStage 15 T quick reference manual online. hipath 1100. OpenStage 15 T telephone pdf manual download. Also for: Openstage 30 t,