First thing I do is make the name of the call que or ring groups very short, example: r1 or s1.
Second thing I do is mess with the settings in here till it looks ok, Sip trunks > trunk in question > Inbound parameters <tab> > Caller numbers/name field:
I find that
"CalledNum" number that has been dialed (default: To->user) : best with TO:user part
"CallerName" caller's name (default: From->display name) : best with FROM: Display Name
"CallerNum" caller's number (default: From->user) : FROM: user part
works ok with call que and snom phones.
see attached pic of incoming call.