[OpenSIPS-Users] Rewriting From header using Contact information

[Julian Yap]

I just tested and this does not work:
remove_hf("From");
append_hf("From: $ct;$ft\r\n");

So basically I want to rewrite the From header by using the details
from the Contact header.

Any suggestions?

- Julian

On Wed, Mar 18, 2009 at 1:15 AM, Julian Yap <julianokyap at gmail.com> wrote:
> I have a scenario where the PSTN to SIP gateway (AudioCodes) I am
> using sets the From header to 'anonymous' when it does not receive a
> Calling Name from the PSTN side.
>
> The modified INVITE from the gateway then looks like this (changed
> some numbers and IP's):
> From: "anonymous" <sip:anonymous at anonymous.invalid>;tag=1c49690767.
> To: <sip:+18085557005 at 192.168.178.50;user=phone>.
> CSeq: 1 INVITE.
> Contact: <sip:8084446503 at 192.168.178.60>.
>
> When the gateway does receive the Calling Name from the PSTN, it looks
> like this:
> From: "HONOLULU     HI" <sip:8083330048 at 192.168.178.60>;tag=1c1248847826.
> To: <sip:+18085557005 at 192.168.178.50;user=phone>.
> CSeq: 1 INVITE.
> Contact: <sip:8083330048 at 192.168.178.60>.
>
> In the first instance, I want to re-write the From header because I do
> in fact have the calling number from the Contact header.  In theory,
> the PSTN gateway should sort this out for me and not send me the
> 'anonymous' From header but I've searched the manuals and it doesn't.
> Anyone else encountered this?
>
> This is the IF statement that satisfies the criteria:
> if($fu=='sip:anonymous at anonymous.invalid' &&
> $ct=~"^<sip:[2-9][0-9]{2}[2-9][0-9]{6}@")
> {
>    xlog("L_INFO", "fix anonymous\n");
> }
>
> The final From would be:
> From: $ct;$ft
>  --> That is Contact header variable;From tag
>
> I had a look at the UAC module but using the function
> uac_replace_from(), I don't know how to strip the '<' and '>' of the
> Contact header to satisfy the arguments of the function.  Is it
> possible?  I'm thinking that using the UAC is preferable to what I'm
> proposing below.
>
> Does this method sound sane?  Or is it dangerous?:
> remove_hf("From");
> append_hf("From: $ct;$ft\r\n");
>
> Thanks,
> Julian
>