7.11 URNs defined within the present document

24.2293GPPIP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Release 18Stage 3TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

7.11.1 Country specific emergency service URN

7.11.1.1 Introduction

The country specific emergency service URN is intended to uniquely identify a type of emergency service for which an emergency service URN, i.e. a service URN with a top-level service type of "sos" as specified in RFC 5031 [69], registered by IANA is not available.

The country specific emergency service URN is intended to be used only when an emergency service URN for a given type of emergency service, with approximately the same caller expectation in terms of services rendered, is not registered by IANA.

The country specific emergency service URN is intended to be used only inside the country where the national regulatory authority defines emergency services only by national numbers. The country specific emergency service URN is not intended to be used by the UE except when indicated by the network.

7.11.1.2 Syntax

The country specific emergency service URN is a service URN with:

1) the top-level service type of "sos" as specified in RFC 5031 [69];

2) the first sub-service of "country-specific";

3) the second sub-service indicating the country where the type of emergency service is deployed. The format of second sub-service is an ISO 3166-1 alpha-2 code as specified in ISO 3166-1 [207]; and

4) the third sub-service uniquely identifying the type of emergency service in the country where the type of emergency service is deployed. The third sub-service is defined by the national regulation of the country where the type of emergency service is deployed. The set of allowable characters for the third sub-service is the same as that for domain names (see RFC 5031 [69]) and the number of characters for the third sub-service shall be less than 64.

EXAMPLE: urn:service:sos.country-specific.xy.567 can identify a type of emergency service identified by an emergency number 567 in a country identified by "xy" ISO 3166-1 alpha-2 code as specified in ISO 3166-1 [207].

7.11.1.3 Operation

Unless explicitly prohibited, wherever an emergency service URN i.e. a service URN with the top-level service type of "sos" as specified in RFC 5031 [69] can be used, the country specific emergency service URN can also be used.

7.11.1.4 Void

7.11.2 ICSI value for RLOS

7.11.2.1 Introduction

This subclause describes the IMS communications service identifier definitions that is applicable for the usage of restricted local operator service (RLOS).

NOTE: The template has been created using the headers of the table in http://www.3gpp.org/specifications-groups/34-uniform-resource-name-urn-list