[SIPForum-discussion] Periodic NOTIFY for SIP SUBSCRIBE

[Ashutosh Panda]

Thanks to all of you for your response.

I will put the question in a more generic manner.

Consider a use case, where UE is in WiFi network and connected to IMS
network. If now Wi-Fi network is down or battery removed from the UE, there
might not be any SIP-De-Registration. But P-Access-Network-Info will be set
as WiFi access and UE will still be registered at IMS and HSS. If UE,
switched on in a cellular network and tries to connect to IMS, there will
be a contention at IMS and HSS. So, there must be someway to De-Register
the UE when WiFi network is down so that there can be a fresh registration
in cellular network.

This is why, there was a thought of periodic notify, and if IMS does not
receive 200OK for a certain SIP-NOTIFY, it will de-register the user
implicitly.

Any inputs on this will be helpful.


Thanks
Ashutosh

On Tue, Sep 15, 2015 at 8:06 PM, Paul Kyzivat <pkyzivat at alum.mit.edu> wrote:

> On 9/9/15 4:06 AM, Ashutosh Panda wrote:
> > Hi All,
> >
> > Can there be periodic NOTIFY messages for same event/subscription state
> > for a SIP SUBSCRIBER for 'reg' event? In other words, can a SIP Server
> > be configured to send SIP NOTIFY say every one minute even though there
> > is no change in subscription state?
>
> It is legal for the server to send messages this way if it wishes. But
> there isn't any standard way for you to force it to do so. You can of
> course *poll* it with a SUBSCRIBE whenever you like.
>
>         Thanks,
>         Paul
>
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