[OpenSER-Users] uac_replace_from and CANCEL

[Bai Shi]

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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