IN&VAS This topic has 1 reply, 1 voice, and was last updated 15 years, 4 months ago by SP 25. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 29th October 2008 at 08:05 #54449 Mohammad Daud HotakGuest dear i am newly start working with gsm technology i am working in IN&VAS i need besic information about IN&VAS. Best Regard Mohammad Daud Hotak 29th May 2009 at 09:31 #54450 SP 25Guest IN billing system Author Posts Viewing 2 posts - 1 through 2 (of 2 total) The forum ‘Telecom Design’ is closed to new topics and replies.