[Kamailio-Users] add Allow header to sl_send_reply

[Daniel-Constantin Mierla]

On 12/19/09 9:50 AM, Olle E. Johansson wrote:
> 18 dec 2009 kl. 22.27 skrev Alex Balashov:
>
>    
>> On 12/18/2009 04:24 PM, Daniel-Constantin Mierla wrote:
>>      
>>> Hi Alex,
>>>
>>> On 12/18/09 9:57 PM, Alex Balashov wrote:
>>>        
>>>> Daniel,
>>>>
>>>> But the documentation
>>>>
>>>> http://www.kamailio.org/docs/modules/1.5.x/textops.html#id2506229
>>>>
>>>> says that append_hf() can be used inside a reply route?
>>>>          
>>> yes, it can be used. The nuance in the initial question, as I
>>> understood, was to add a header to a reply for current processed
>>> request. with append_hf you add a header to the current processed sip
>>> message (no matter is request or reply).
>>>
>>> append_to_reply() adds a header to any eventual reply kamailio may send
>>> for the request being processed, not visible in the request if that is
>>> forwarded.
>>>
>>> Just to give an example, save("location") sends a reply from inside the
>>> function. If you want to have a custom header in that reply, that can be
>>> done with append_to_reply().
>>>        
>> Oh, I see.  I did not realise append_hf() always applied to the request context only.  Thanks a lot!  Learn something new every day.
>>      
> I think the confusion is about which message you process in the on_reply branches - you actually process the initial request that you triggered with a reply route in the initial processing, not the reply. Thus if you use append_hf - you add a header to the request, not the response.
>
>    
a clarification for above: in onreply_route you process the reply and 
append_hf() adds a header to reply.

To put it in another words:
- in route {...} - sip request is processed and append_hf() adds a 
header to that request. If you want to send a reply for that request 
from kamailio, then append_to_reply() can be used to add headers in the 
to-be-built reply
- in onreply_route - sip reply is processed and append_hf() adds a 
header to that reply. append_to_reply() cannot be used in onreply_route.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla
* http://www.asipto.com/