C.1 Interworking SIP to ISUP

29.1633GPPInterworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networksTS

Table C.1.1 shows the mapping of a "cpc" URI parameter received within tel URI or the userinfo part of SIP URI with user="phone" in a P-Asserted-Identity header in the initial INVITE request to the Calling party’s category parameter in the ISUP IAM. When the "cpc" URI parameter value "operator" is received the I-MGCF shall use an Accept-Language header field to determine the value of the Calling party’s category parameter.

Table C.1.1: Mapping of the CPC parameter to the ISUP Calling party’s category parameter

SIP Parameters		ISUP Parameters
"cpc" URI parameter in P-Asserted-Identity (NOTE 2)	Accept-Language	Calling party’s category
operator	fr	operator, language French
operator	en	operator, language English
operator	de	operator, language German
operator	ru	operator, language Russian
operator	es	operator, language Spanish
ordinary		ordinary calling subscriber
test		test call
payphone		payphone
unknown		calling party’s category unknown at this time (national use)
mobile-hplmn		mobile terminal located in the home PLMN
mobile-vplmn		mobile terminal located in a visited PLMN
emergency		emergency service call per ANSI Standard ATIS-1000113.2005 [117] (NOTE 1)
NOTE 1: This is a national/regional specific value. Interworking shall only occur when interconnecting with indicated national network. NOTE 2: In case the "cpc" URI parameter is absent or contains values that are not mapped per this table then the ISUP shall contain the default CPC value "ordinary calling subscriber".

In case the Accept-Language header field is not received or contains values that are not in this table then based on operator policy the Calling party’s category parameter shall contain the CPC value "operator, language X" (where X is one of the following languages: French, English, German, Russian or Spanish) or national/regional specific value.