[OpenSIPS-Users] Rewriting From header using Contact information

[Bogdan-Andrei Iancu]

Hi Julian,

Do not do that as you will break the dialog consistency - you change one 
message from the dialog, but all the other will carry the original FROM.

So, do you the uac_replace_from() function.

use $ct and avp_subst() (over the $ct) to extract only the  part of the  
contact you need. 

Regards,
Bogdan

Julian Yap wrote:
> 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
>>
>>     
>
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