[OpenSIPS-Users] NOTIFY results in SIP/2.0 400 Missing or invalid message-summary

[Răzvan Crainea]

Hi, Alexander!

In my opinion, the client does not handle the Notify properly - when the 
client subscribes, (according to RFC 3842) OpenSIPS must send a NOTIFY 
with its current state - if he doesn't have any messages, the message 
body is empty. The client must not reject this message, but accept it 
and update its current state.

Another thing that I noticed is that OpenSIPS lowers the SUBSCRIBE 
expiration to 600 seconds. Looks like the client ignores this 
limitation, and doesn't SUBSCRIBE before timeout. That's why after 10 
minutes OpenSIPS sends a graceful shutdown NOTIFY with 
Subscription-State: terminated;reason=timeout.

Nevertheless, the SIP client should not stop working, regardless the 
traffic it received.

PS: next time please use an external service such as pastebin.com to 
post code snippet.

Best regards,

Răzvan Crainea
OpenSIPS Developer
www.opensips-solutions.com

On 09/15/2017 10:01 AM, Alexander N. Lunev via Users wrote:
> Hello everyone!
>
> We're using some Chinese GPON CPE with SIP clients in it with OpenSIPS 
> 2.2.3 as a server, and we're having a problem: after successful 
> REGISTER client starts SUBSCRIBE process for event "message-summary", 
> and after authorization pass, server sends NOTIFY with "Event: 
> message-summary", but client respond to it with "SIP/2.0 400 Missing 
> or invalid message-summary" message.
>
> On which side is error?
>
> In opensips.cfg SUBSCRIBE is handling by this part: