[Freeswitch-users] Mod-Sofia ability to dial Alphanumeric characters in invite?

Hello Guys, Is it possible to use FS with alphanumeric characters in the SIP invite? As in I would like to send an invite addressed to +C27344xxxxxxxxxx as one of our upstream platforms uses a C prefix. What I observe with default is " [ERR] mod_sofia.c:4431 Invalid URL " If possible to support what would need to be changed? I am assuming that this is outside the SIP standards, but confirmation would equally be useful. Thanks Magnus