Trr7 MSC Siemens Tiemer This topic has 1 reply, 1 voice, and was last updated 18 years, 12 months ago by erox. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 5th May 2005 at 07:57 #41011 AymanGuest Can you explain me the fonctionality for Trr7 Timer In MSC siemens. Regards 5th May 2005 at 10:51 #41012 eroxGuest Hi! I know for T7 timer in Siemens switch which uses for features CCBS (Call Completion for Busy Subscriber). This T7 timer at the B-MSC supervises the maximum time (15…45 min – administrable) a certain CCBS request is active there. regards! Author Posts Viewing 2 posts - 1 through 2 (of 2 total) The forum ‘Telecom Design’ is closed to new topics and replies.