[asterisk-dev] SIP subscription with expires=0

[Nikša Baldun]

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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