[asterisk-users] MWI, Realtime SIP, Voicemail and Extensions, UAs registered with SER

[kjcsb]

I have the following setup:
- UAs registered with SER/OpenSER
- SIP peers (non cached), extensions, voicemail setup (not message storage) 
defined in Asterisk 1.2 using Realtime

When a message is left in the user's mailbox, no Notify message is sent to 
SER.

1. If the SIP peer is defined in sip.conf with a host=ser.domain.com then 
the notfy is sent to SER.
2. If realtimecache=yes is set in sip.conf and the SIP peer is visible with 
sip show peers and the SIP peer host field is set to ser.domain.com then the 
notify is sent to SER.

I have read numerous articles regarding this including:
- the posting 
http://www.asteriskguru.com/board/need-help-for-voicemail-notification-vt535.html 
refers to a patch noted on http://www.voip-info.org/wiki-Asterisk+at+large. 
The patch is listed under Method 3, which relies on sip peers being defined 
in sip.conf i.e. it doesn't work for non cached realtime.
- Method 1 of http://www.voip-info.org/wiki-Asterisk+at+large describes a 
way to send the Notify direct to the SIP UA. This relies on the phone 
contact details (e.g. IP address) being defined in sip.conf - not applicable 
in my case.
- Method 2 of http://www.voip-info.org/wiki-Asterisk+at+large relates to SIP 
UAs registered with SER and states that Asterisk sends NOTIFY only to UACs 
that are registered at the Asterisk. This is not the case as described in 1 
above and Method 5 of Asterisk-at-large.
- Method 4 of http://www.voip-info.org/wiki-Asterisk+at+large assumes cached 
SIP realtime peers. I don't want to cache.
- the posting http://forums.digium.com/viewtopic.php?t=4363&highlight 
relates to SIP UAs registered with Asterisk, not those registered with SER.
- the article 
http://openser.org/dokuwiki/doku.php/asterisk:realtime-integration doesn't 
deal with MWI.
- the posting http://asterisk.mdaniel.net/?p=14 creates the msg<num>.txt 
file on a remote Asterisk server and so is not relevant to my scenario.

Can anyone advise how they are sending SIP Notify messages from Asterisk to 
SER for non-cached realtime SIP peers?

Regards

Cameron