[OpenSER-Users] uac_replace_from and CANCEL

[Bogdan-Andrei Iancu]

Hi Andreas,

uac_replace_from() is not supposed to be called from branch route 
(directly or not) - see the documentation. There are some limitation due 
lumps and flag propagation. Most sure this is the reason for not working 
correctly in your case.

For branch route support, there is patch/featur request on the tracker, 
but is not yet working properly.

Regards,
Bogdan


Andreas Granig wrote:
> Or, to be more specific, I call it from a route which is called by a 
> branch_route. Not sure if that matters.
>
> Andreas
>
> Andreas Granig wrote:
>> Bogdan,
>>
>> I just tested with 1.3.1, and there the From of the CANCEL is also 
>> NOT updated. A probably not so unimportant side-note is that I call 
>> uac_replace_from() from a branch_route.
>>
>> Andreas
>>
>> Bogdan-Andrei Iancu wrote:
>>> Hi Bai Shi,
>>>
>>> I just tested (to be sure no bugs are present) and in 1.3, the 
>>> CANCELs are automatically updated (the FROM header), as expected.
>>>
>>> Regards,
>>> Bogdan
>>>
>>> Bai Shi wrote:
>>>> Hi, Thomas,
>>>> This will do in openser 1.2, however, in openser 1.3 it won't do 
>>>> any help. The CANCEL will be sent out regardless what you have done 
>>>> to the request, but follow the information in the original INVITE. 
>>>> I tested it and suffered a lot ;(
>>>> Rgds,
>>>> BS
>>>>
>>>> -----Original Message-----
>>>> From: users-bounces at lists.openser.org 
>>>> [mailto:users-bounces at lists.openser.org] On Behalf Of Andreas Granig
>>>> Sent: 2008年3月13日 2:54
>>>> To: Thomas Gelf
>>>> Cc: users at openser.org
>>>> Subject: Re: [OpenSER-Users] uac_replace_from and CANCEL
>>>>
>>>> Hi Thomas,
>>>>
>>>> Yes, I'm doing it that way now (without that "append_branch()" 
>>>> though), but if you have an uuid-based setup where you fetch the 
>>>> uuid from the subscriber table during authentication of the INVITE 
>>>> and then with that uuid fetch dynamic data from the usr_preferences 
>>>> table to be used for "uac_rewrite_host()", then you have to do some 
>>>> work-arounds and hacks to get that data for the CANCEL as well, 
>>>> which could be quite a pain.
>>>>
>>>> So yes, it would be really great if this could be done 
>>>> automatically *hint hint* :)
>>>>
>>>> Andreas
>>>>
>>>> Thomas Gelf wrote:
>>>>
>>>>> Applying uac_replace_from() to the CANCEL request should do the job,
>>>>> it sadly doesn't happen automagically :'-(
>>>>>
>>>>> Try something like:
>>>>>
>>>>> if(is_method("CANCEL") && uri =~ "^sip:...")
>>>>> {
>>>>> if(t_check_trans())
>>>>> {
>>>>> rewritehostport("...");
>>>>> uac_replace_from("...");
>>>>> append_branch();
>>>>> }
>>>>> if(!t_relay())
>>>>> {
>>>>> sl_reply_error();
>>>>> }
>>>>> }
>>>>>
>>>>> Cheers,
>>>>> Thomas Gelf
>>>>>
>>>>> Andreas Granig schrieb:
>>>>>> Hi,
>>>>>>
>>>>>> I hit another problem with a Cisco PGW in combination with 
>>>>>> CANCEL, and I'm not sure which fault it is. If I do 
>>>>>> uac_replace_from in the INVITE, the From-Header is altered 
>>>>>> somehow and sent to the PGW. So if A calls B where B is a PGW, 
>>>>>> the From from A to OpenSER is for example sip:a at somedomain and 
>>>>>> from OpenSER to B it's sip:other-a at somedomain.
>>>>>>
>>>>>> If the call is cancelled, the From-header isn't altered, so the 
>>>>>> From from A to OpenSER is sip:a at somedomain and from OpenSER to B 
>>>>>> it's sip:a at somedomain as well.
>>>>>>
>>>>>> Now the PGW seems to ignore this CANCEL, and I guess it's because 
>>>>>> of the different From-usernames, since it works if I don't do any 
>>>>>> uac_replace_from.
>>>>>>
>>>>>> RFC3261 says in §9.1:
>>>>>> The Request-URI, Call-ID, To, the numeric part of CSeq, and From 
>>>>>> header
>>>>>> fields in the CANCEL request MUST be identical to those in the
>>>>>> request being cancelled, including tags.
>>>>>>
>>>>>> So is it correct behavior of the PGW because the From header in 
>>>>>> the CANCEL is different from the From header in the INVITE? 
>>>>>> Should OpenSER alter the From in the CANCEL as well? Or should 
>>>>>> the PGW just check the From tags, but not the From URI?
>>>>>>
>>>>>> Andreas
>>>>>>
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>