[Freeswitch-users] Getting user-agent string at time of call

Hi, I m doing user dialplan processing through mod_xml_curl . I understand that FS passes some pre-defined params to the mod_xml_curl handler script like dnis,dnid,callerid, but i wonder if i can also get the user-agent string of the user who is trying to make a call. This way, i want to be able to dynamically create the codec string to be used for the call according to the UA being used. (eg: AMR codec for nokia handsets etc. BTW, is AMR support avaialble yet in FS ?) Thanks very much! -ashutosh