Dear Member, Could anyone explain to me how is Remote Party ID header is used and is it related to P-Asserted-Identity? Is this a new SIP extension? Thank you. -- Cheers, Asiatel Singapore Pte Ltd Andrew Yu 19 Jalan Kilang Barat #06-01, Acetech Centre Singapore 159361 Tel: +65 6271 8233 Fax: +65 6274 4266