cells without SDCCH This topic has 1 reply, 1 voice, and was last updated 16 years, 6 months ago by Vanderley. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 18th September 2006 at 07:46 #45745 sanjayGuest Which BSC are u using? Its quite possible to iniatite a call in ericsson BSC without SDCCH by using TCH for call set up. Here CHAp value is set at 2. 20th September 2006 at 14:24 #45746 VanderleyGuest You need SDCCH at least for SMS and LU. In siemens call setup without SDCCH is called Direct TCH assignment. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) The forum ‘Telecom Design’ is closed to new topics and replies.