Hi, I'm trying "P-Asserted-Identity" header against a Nortel CS2000_NGSS/8.0. It works (the number in PAI header is shown as PSTN callerid number) in those cases: P-Asserted-Identity: <sip:+34666555444@host/IP> P-Asserted-Identity: <tel:+34666555444@host/IP> As you can see, the second case is wrong since a "tel" uri has no host part according to RFC 3966 [1]. And the worst thing is that Nortel disallows or doesn't understand a correctly formed "tel" uri in PAI header as this: P-Asserted-Identity: <tel:+34666555444> My experience with gateways is very limited and new, but I should assume that it is a sad bug in the Nortel SIP stack, is it? Thanks for any help. [1] RFC 3966: http://www.faqs.org/rfcs/rfc3966.html -- Iñaki Baz Castillo