Open Interface This topic has 0 replies, 1 voice, and was last updated 22 years, 9 months ago by Raghava Rao. Viewing 1 post (of 1 total) Author Posts 15th December 2001 at 05:06 #33703 Raghava RaoGuest Can somebody please clarify about V5.1 & V5.2 ( which are used for Telecom switching). Author Posts Viewing 1 post (of 1 total) The forum ‘Telecom Design’ is closed to new topics and replies.