[asterisk-dev] SIP subscription with expires=0

[Olle E. Johansson]

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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