Multiple SUA SGs, sending for SSP from SGs

Hello Folks,

Let's consider two SUA SGs which provide connectivity to an SSN in IP network.
SUA RFC (section 5.1.2.3.) suggests sending an SSP from an SG when the
AS serving the SSN goes inactive in the SG and I also assume in case
the SG loses connectivity to the AS.

5.1.2.3.  Unsuccessful ASP Fail-over scenario

     ASP-a1            ASP-a2                SG                  SEP
   (Primary)           (Backup)
       +-------------ASP Inactive------------->
       <-----------ASP Inactive ACK-----------+
       <--------------------NTFY (AS Pending)-+
                         <--NTFY (AS Pending)-+
             After some time elapses (i.e., timeout).
                                              +--------SSP-------->
                                              <--------SST--------+
       <-------------------NTFY (AS Inactive)-+
                         <-NTFY (AS Inactive)-+



What shall be done in multiple SGs scenario when the SSN is allowed
via another SG?

Is this a realistic example?

Thank you in advance

--
Ilie