[SIPForum-discussion] Query regarding Voicemail-Subscription

[Aniella Juverdeanu]

Yes - with VM it can be implicit subscribe to avoid lots of messages - we use it in our network - some vendors set this implicit subscribe - worked well for the last few years now.

Thx
Aniella 

-----Original Message-----
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Paul Kyzivat
Sent: September 27, 2014 10:31 AM
To: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Query regarding Voicemail-Subscription

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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