Bad Username: & Bad Hostname:

[junk]

I am running IMServ and some of my clients are compailing about 
Usernames and Hostnames when they log in to imserv.

*** Notice -- Bad Username: +17278085 Nickname: AIM-17278085661 From: 
imserv.int(via imserv.int)
 *** Notice -- Bad Hostname: +17278085.imserv.int Nickname: 
AIM-17278085661 From: imserv.int(via imserv.int)

Those are mobile cell numbers from AOL.

Is there any way to fix the ircd to allow "+"?

Thanks
Wade