[Kamailio-Users] Prefix with variable?

Hi! I'm running into a little problem using the prefix() function. According to the docs I can only use strings as prefixes and this works fine everywhere in our config. Now I'm trying to do something like this: prefix($avp(s:t_prefix)); Customer should be able to choose their own prefixes for certain types of traffic. We get a custom prefix in from the PSTN gateways, where we want to then replace that "internal" prefix (strip(4)) with a configurable prefix. Why can't we use variables in the prefix function? I could try to use $ru = $avp(s:t_prefix) + $original_ru or something, but on a short try-run this didn't seem as easy as that. Any ideas or anyone doing something like this? /robin -- Robin Vleij robin(a)swip.net