[default] [from-internal] exten = 6002,1,Dial(PJSIP/BOB,,b(section-setheaders^setheaders^1)) [section-setheaders] exten = setheaders,1,Set(PJSIP_HEADER(add,P-Asserted-Identity)=sip:01234456789@domain.local) same = n,Return()