Roman Hochuli wrote: [..]
OTOH I'd be interested to hear if any of our peers is blocking our prefix since they are the main audience for our services...
According to http://www.sixxs.net/tools/grh/dfp/ripe/ :
2001:7f8:24::/48 SWISSIX-20031113 AS20612 72%
As such only 72% of the BGP peers of GRH actually have that prefix. Then peek at http://www.sixxs.net/tools/grh/lg/?find=2001:7f8:24::/48 and you will find the active peers who are not seeing the prefix.
Of course, more ISP's are always welcome to donate their prefixes to the system with the little cost of a EBGP connection to GRH, but as can be seen above this allows one to very easily see what is going on and where.
Telia seems to be your only transit btw, you might want to checkup if filters really allow the IX prefix out from their network.
Greets, Jeroen