name: SSS
full_form: Secondary Synchronisation Signal
context: This section illustrates the case where either supplementary services (SSs) or a 3rd party is involved. It is also possible that both SSs and a 3rd party are used. In this case the steps 1-4 are the same as for the case of simple PUCI invocation given above. Figure 7.2-6: PUCI invocation with 3rd party PUCI AS and SS. The PUCI AS then invokes a 3rd party or SSs. This message could be an extended SIP INVITE message. The 3rd party or SS then checks (I) and gives marking (M2). In case of SS this could be an error code as defined by IETF [14] or the SS could be extended to give marking defined for PUCI. Marking in the described form might not be required in all cases. For example, in the case of SSs with Black List/White List (BL/WL) a marking in the sense of a UC score is not necessary. In the case of a BL the UC score (M) is 100% if the caller is on the BL and 0% if the caller is not on the BL. M2 is sent to the PUCI AS. This message could be an extended SIP INVITE message. The PUCI AS
description: Supplementary Services (SSs) refer to additional telecommunication services that can be invoked during a call or session, such as Black List/White List (BL/WL), which provide specific functionalities like caller screening and marking. These services are used in conjunction with the main communication service.
explanation: The text explicitly states that Supplementary Services (SSs) are additional telecommunication services that can be invoked during calls or sessions, aligning with the definition of a service.
section_title: 7.2.5.3	PUCI with Supplementary Services and 3rd Party PUCI AS
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