On 31-07-14 15:06, Joshua Colp wrote:
Jonas Kellens wrote:
On 31-07-14 14:28, Joshua Colp wrote:
Jonas Kellens wrote:
Hello,
I read on Yealink support that Yealink IP-phones expect
"Subscription-State:terminated" for there Presence/BLF-functionality.
So how can I get "Subscription-State:terminated" on Asterisk ?
That would be a bit strange as the subscription would then be
terminated, no more NOTIFY messages would go to it which would defeat
the purpose of subscribing to something. The only way to achieve that
would be to have the phone unsubscribe or to change the code to force
it to terminate the subscription under certain circumstances. This
would require knowing the exact specifications and details of what
they expect and when. Is there currently a problem you are facing with
subscription support?
Hello,
this "Subscription-State:terminated" is expected when the IP-phone goes
offline (Unregister or cut off from power).
I would expect that if the phone that went offline was subscribed to
stuff and the subscription expired.
At that moment indeed the IP-phone no longer sends NOTIFY messages.
Also, Asterisk knows very well the SIP peer becomes unreachable (see my
first post). But still Asterisk replies "Subscription-State: active" to
the IP-phones that request the state of the offline SIP peer.
Generally IP phones don't send NOTIFY messages. They are sent NOTIFY
messages to inform them of the state of things they have subscribed to
(such as devices or mailboxes).
Yealink expects "Subscription-State:terminated" so the Yealink IP-phone
can put out the BLF light (in stead of staying in a green mode, which
indicates that the SIP peer is still online but not in a call).
Sending Subscription-State:terminated terminates the subscription. If
the device in question comes back online you can't send any new NOTIFY
messages because the subscription is gone. The state of what you are
subscribed to and the underlying state of the subscription itself are
different things.
So I can follow the Yealink logic. Can you ?
Not really as it doesn't make sense to me. Do you have a link to the
documentation for this?
I've also done a search on the issue tracker and there have been no
issues filed ever about subscriptions and specifically Yealink.
Hello,
I was reading this post :
http://forum.yealink.com/forum/showthread.php?tid=894
Jonas.
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