Deregistration issue

Hello,

 

We have this scenario:

 

Clients send registration requests, SBC create cache and register with Call Agent.

200 OK goes back from CA to SBC then 200 OK back to clients, with expiration time, let say 120 secs.

 

If client doesn't re-register within 120 sec., then SBC will de-register but CA sends back 401 Unauthorized, not honored by SD.

 

Therefore CA, that has longer registration expiration, tipically an hour, will not de-register the client.

 

Any way out of this scenario?

 

Any help/ideas greatly appreciated.

 

Thanks,

 

Marcel