Q. In the INVITE sent from MSS towards IMS for SRVCC, what is the value set in the Request-URI inside this INVITE?
a) IMSI
b) ATU-STI
c) STN-SR
d) MSISDN
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Correct answer: Letter c.
In SRVCC (Single Radio Voice Call Continuity), the INVITE from MSS (Mobile Switching Center Server) to IMS contains the STN-SR (Session Transfer Number for SRVCC) in the Request-URI, which is used to route the session to the correct S-CSCF in IMS.
Q. In the INVITE sent from MSS towards IMS for SRVCC, what is the value set in the Request-URI inside this INVITE?
a) 
“IMSI”
→ Incorrect. IMSI is not used in the Request-URI for SRVCC INVITE.
b) “ATU-STI”
→ Incorrect. ATU-STI is used in SRVCC procedures but not in Request-URI.
c) 
“STN-SR”
→ Correct. The STN-SR is set in the Request-URI for routing.
d) “MSISDN”
→ Incorrect. MSISDN is not used in the Request-URI for SRVCC INVITE.
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