The "fast" (via B channel) TDM software download (snowball system) does not work if the OpenStage TDM is also configured for 1st Party CTI (AMO SBCSU, DVCFIG=API). This is because the terminal must be configured for B channel download in the AMO SBCSU using DVCFIG=VIRTDTE. However, for 1st Party CTI, DVCFIG=API must be configured in the AMO SBCSU. Both are not possible at the same time.

The only alternative for customers that use 1st party CTI on OpenStage TDM telephones is the "slow" software download via the D channel, which must be activated separately for each telephone in OpenScape 4000 Assistant.