Re: [Asterisk-java-users] Wrong PJSIP_HEADER read

[Salahuddin A. <tx...@gm...>]

Hello Yves,

Thanks for your response and I am very sorry for the late reply.

OS: Debian (Jessie)
Asterisk: 13.20.0
Asterisk-Java: 2.0.3

Actually, regenerate this issue is a little harder, but in our environment,
in sipp we send a cancel from caller side after few milliseconds (50-58ms)
then this issue has been occurring. We did not set any delay in our agi
script. I think if you use multiple getVariable in the invite agi and send
a cancel from caller side immediately after INVITE, this issue should have
occurred.

Please let us know if is it possible to do any help from our side to
regenerate this issue.

Thanks & Regards,
Salah Ahmed

On Sun, Dec 23, 2018 at 6:47 PM Yves <yv...@gm...> wrote:

> Hello Ahmed,
>
> thanks for you valuable findings. To find out, whats going on, I´d like to
> copy your setup; so, what versions are you using concerning
> - OperatingSystem
> - Asterisk
> - Asterisk-Java
>
> How do you "time" the Hangup so that it occurs between the two
> getHeader-Methods... or do you delay the execution in between
> to better simulate, whats going on, if this special case occurs?
>
> regards,
> Yves
>
> Am 21.12.2018 um 01:08 schrieb Salahuddin Ahmed:
>
> Hello,
>
> Let's explain the issue,
> In our agi script has those following header read,
>
> AGI Code:
> =========================================
> String fromHeader = getHeaderValue("FROM");
> String paidHeader = getHeaderValue("P-ASSERTED-IDENTITY");
> String privacyHeader = getHeaderValue("PRIVACY");
> String toHeader = getHeaderValue("TO");
> =========================================
>
> 4573 port trace
> =========================================
> T 172.32.60.11:4573 -> 172.32.10.70:38630 [AP]
>  GET
> VARIABLE"PJSIP_HEADER(read,FROM)".
>
> #
> T 172.32.10.70:38630 -> 172.32.60.11:4573 [AP]
>  HANGUP.
>
> #
> T 172.32.60.11:4573 -> 172.32.10.70:38630 [AP]
>   GET VARIABLE
> "PJSIP_HEADER(read,P-ASSERTED-IDENTITY)".
>
> #
> T 172.32.10.70:38630 -> 172.32.60.11:4573 [AP]
>   200 result=1 (<sip:12016615429@172.32.100.100>;tag=1).
>
> #
> T 172.32.60.11:4573 -> 172.32.10.70:38630 [AP]
>   GET VARIABLE
> "PJSIP_HEADER(read,PRIVACY)".
>
> #
> ===========================================
>
> When a new call arrived those lines are executing, and during that
> execution, if caller canceled the call then a HANGUP message send from
> asterisk to asterisk-java. If asterisk-java waits for any response of one
> of those 4 requests then I think asteris-agi get confused and the all
> further response will be shifted. Now according to code if asterisk-java
> received a response without "200 result=1" format, it discards that
> response, but this response does not belong to that request. In the next
> read, the actual value will appear.
>
> Now in this scenario,  what would be the solution? could anyone please
> suggest this?
>
> Thanks,
> Salah Ahmed
>
> On Tue, Dec 18, 2018 at 1:31 PM Salahuddin Ahmed <tx...@gm...>
> wrote:
>
>> Hello,
>>
>> Recently I have noticed an error in my service. After some investigation,
>> we found that its due to some calls is terminated very early.
>>
>> The scenario is, If Caller-A sends an INVITE to Asterisk, This INVITE
>> processed on an agi method. On that method, we read several sip custom and
>> default sip header for our processing.
>>
>> But during this processing, if Caller-A sends CANCEL then some header
>> value read get malformed. Actually, it seems it gets shifted, suppose if we
>> read To header first and then cseq, TO header value set to cseq value and
>> TO return NULL. We have added some debug log in asterisk code and found,
>> asterisk return good value. The time between INVITE and CANCEL is 50 ms.
>>
>> We have implemented AGIHangupException in our agi method, but this
>> exception does not catch by this CANCEL request.
>>
>> Any idea/solution is appreciated.
>>
>> Thanks in advance,
>> Salah Ahmed
>>
>
>
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