[asterisk-dev] SIP subscription with expires=0

[Nikša Baldun]

According to the RFC, yes:

>        In addition to being a request to unsubscribe, a SUBSCRIBE message
>        with "Expires" of 0 also causes a fetch of state; see section
>        3.3.6.
I'll report a bug. Thanks for your reply.

On 25. 10. 2021. 09:25, Olle E. Johansson wrote:
> A subscription with expire:0 should get at least ONE notify, right? 
> I’ve just that to check the status without setting up a dialog.
>
> It is not invalid. Report this as a bug.
>
> /O
>
>> 25 okt. 2021 kl. 09:22 skrev Nikša Baldun <it at voxdiversa.hr>:
>>
>> Hello,
>>
>> I see the following in res_pjsip_pubsub.c:
>>
>>         if (expires_header->ivalue == 0) {
>>             ast_debug(1, "Subscription request from endpoint %s 
>> rejected. Expiration of 0 is invalid\n",
>>                 ast_sorcery_object_get_id(endpoint));
>> pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 
>> 400, NULL, NULL, NULL);
>>                 return PJ_TRUE;
>>         }
>>
>> However, according to RFC 2365, value 0 is perfectly valid, and 
>> should have the effect of ending the subscription.
>>
>>
>>>     A natural consequence of this scheme is that a SUBSCRIBE with an
>>>     "Expires" of 0 constitutes a request to unsubscribe from an event.
>>
>> Or is my understanding wrong? Is there some other way to unsubscribe?
>>
>> Best regards,
>>
>> Nik
>>
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