[SIPForum-discussion] Query regarding Voicemail-Subscription

[Paul Kyzivat]

On 9/23/14 8:08 AM, Durgesh kumar singh wrote:
> Hello
>
> I have one query related to our SIP project.
>
> *Is it possible to receive voicemil Notify without sending any subscribe
> to SIP server ?*
>
> Actually in our case we are using Intraswitch SIP server to register our
> client which support the Voicemail.
>
> So when our client register then without sending any SUBSCRIBE packet we
> receiving the NOTIFY from server which indicate our Voicemail counter.

This is incorrect according to all published IETF specs I am aware of.
But I know it occurs in the wild. What software is generating it?

	Thanks,
	Paul

> Till now what i know that, for any type of Notification, SIP client
> first need to send subscribe (For Voicemail) to SIP server and then we
> receive Notify from SIP server whose SIP flow is below mentioned.
>
>
> SIP Client  |-----SUBSCRIBE---->| SIP Server
> SIP Client  |<-------200--------| SIP Server
> SIP Client  |<------NOTIFY----- | SIP Server
> SIP Client  |--------200------->| SIP Server
>
>
> So please help me to figure out this query that for any Notify,
> Subscribe is necessary or it's depend on server configuration.
>
>
> Thanks,
> Durgesh K singh
>
>
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