Re: [SR-Users] subst_hf to rewrite a contact header

The literal contact header (after subst_hf mangling) became Contact: <sip:2018092417381900003@81.x.x.x <sip:2018092417381900003@81.x.x.x>> sip:b73c6f29-0101-4802-afcd-efb63f1e6d8f@10.10.10.12:5090;transport=udp <sip:b73c6f29-0101-4802-afcd-efb63f1e6d8f@10.10.10.12:5090;transport=udp> Which is completely bogus. I was trying (as a temporary hack) to mangle this to become Contact: <sip:2018092417381900003@81.x.x.x <sip:2018092417381900003@81.x.x.x>> Which would have matched the contact header from the INVITE and then I would have seen whether this affects the subsequent ACK for the 200 OK. But my usage of subst_hf() turned this (syntactically correct yet uninterpretable) header Contact: <sip:b73c6f29-0101-4802-afcd-efb63f1e6d8f@10.10.10.12:5090;transport=udp> into Contact: <sip:2018092417381900003@81.x.x.x <sip:2018092417381900003@81.x.x.x>> sip:b73c6f29-0101-4802-afcd-efb63f1e6d8f@10.10.10.12:5090;transport=udp <sip:b73c6f29-0101-4802-afcd-efb63f1e6d8f@10.10.10.12:5090;transport=udp> The code for the mangling is this: $var(ctct) = "<sip:2018092417381900003@81.x.x.x <sip:2018092417381900003@81.x.x.x>>"; subst_hf("Contact", “/\<.+\>/$var(ctct)\r\n/", "a”); Which is why I originally asked about how to use subst_hf just to debug the missing ACK.