V5.1 signalling protocol This topic has 0 replies, 1 voice, and was last updated 19 years, 6 months ago by Ivan. Viewing 1 post (of 1 total) Author Posts 28th July 2005 at 14:01 #41815 IvanGuest Hello All. I need to source code V5.1 signalling protocol. Please help me! Author Posts Viewing 1 post (of 1 total) The forum ‘Telecom Design’ is closed to new topics and replies.