[Kamailio-Users] Username of P-Asserted-Identity header

Hi, all! Is there an easy possibility to get the Username of the P-Asserted-Identity header? When i use $ai i get for example "sip:+4942317769999@testdomain.de". I need only "+4942317769999" in a variable. I know for example that i can use $fU and get only the Username (and $fu gives me the whole From URI).... Cheers, Marco Marco Bungalski GmbH Traversale 5 27283 Verden Telefon: +49 4231 - 776 9999 Fax: +49 4231 - 776 9998 Mobil: +49 172 4204774 e-mail: Marco(a)Bungalski.de www.bungalski.de www.t-m-net.de Geschäftsführender Gesellschafter: Marco Bungalski Sitz der Gesellschaft: D-27283 Verden, AG Walsrode HRB 120586