teles ag isdn replacement voip zwischenbericht q2 2014 hosted pbx ip pbx mobile centrex interim financial statement q3 2014 quartalsbericht q3 2014 teles ag converged ip core replicate pstn services ss7 all-ip ip-based access nodes/applications ip networks/interconnections geschäftsbericht 2013 interim report q1 2014 interim report q2 2014 fixed mobile convergence converged ip centrex
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