asterisk users - Nov 2020 - Changing the contact header

Hi,

Is anyone aware of any way of changing the contact header on a call? We are
sending 911 calls to a provider and they require that the contact be the
call back number. I tried:
Set(PJSIP_HEADER(update,contact)=<sip:foobar at 1.1.1.1:5090>)

But the came back with:
No headers had been previously added to this session.

If I try to do:
Set(PJSIP_HEADER(add,contact)=<sip:foobar at 1.1.1.1:5090>)
Then Asterisk just adds a second contact header but does not replace the
original (I also suspect adding a contact breaks the RFC?)

Is anyone aware of a way to modify the contact header?

TIA.

Dovid
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.digium.com/pipermail/asterisk-users/attachments/20201125/ae570b8d/attachment.html>

Hi David,

I chanced upon your question while I was looking for the same thing
myself. I don't know whether this is still relevant to you, given that
it's over 2 years ago since you asked the question.

There's an option in the global section of pjsip.conf that defaults to
"no", but if you set it to yes, the user part of the Contact header
will be taken from the value of CALLERID(num):

I found this looking at the source code in res_pjsip.c - there's a load
of XML documentation at the top.

[global]
use_callerid_contact=yes

Cheers,
Kingsley.

On Wed, 2020-11-25 at 05:58 -0500, Dovid Bender wrote:
> Hi,
> 
> Is anyone aware of any way of changing the contact header on a call?
> We are sending 911 calls to a provider and they require that the
> contact be the call back number. I tried:
> Set(PJSIP_HEADER(update,contact)=<sip:foobar at 1.1.1.1:5090>)
> 
> But the came back with:
> No headers had been previously added to this session.
> 
> If I try to do:
> Set(PJSIP_HEADER(add,contact)=<sip:foobar at 1.1.1.1:5090>)
> Then Asterisk just adds a second contact header but does not replace
> the original (I also suspect adding a contact breaks the RFC?)
> 
> Is anyone aware of a way to modify the contact header?
> 
> TIA.
> 
> Dovid
>