8.71 IMS registration information +CIREG

27.0073GPPAT command set for User Equipment (UE)Release 18TS

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

Table 8.71-1: +CIREG parameter command syntax

Command	Possible response(s)
+CIREG=[<n>]	+CME ERROR: <err>
+CIREG?	+CIREG: <n>,<reg_info>[,<ext_info>]
+CIREG=?	+CIREG: (list of supported <n>s)

Description

The set command controls the presentation of an unsolicited result code +CIREGU: <reg_info>[,<ext_info>] when there is a change in the MT’s IMS registration information. Refer clause 9.2 for possible <err> values.

The read command returns <n>, that shows whether reporting is enabled or disabled, <reg_info> that shows whether one or more of the public user identities are registered and optionally <ext_info>, that shows the status of the MT’s IMS capabilities. For <ext_info>, all relevant values are always summarized and reported as a complete set of IMS capabilites in the unsolicited result code.

The test command returns the supported values for <n> as a compound value.

Defined values

<n>: integer type. Enables or disables reporting of changes in the MT’s IMS registration information.

0 disable reporting.

1 enable reporting (parameter <reg_info>).

2 enable extended reporting (parameters <reg_info> and <ext_info>).

<reg_info>: integer type. Indicates the IMS registration status. The UE is seen as registered as long as one or more of its public user identities are registered with any of its contact addresses, see 3GPP TS 24.229 [89].

0 not registered.

1 registered.

<ext_info>: numeric value in hexadecimal format. The value range is from 1 to FFFFFFFF. It is a sum of hexadecimal values, each representing a particular IMS capability of the MT. The MT can have IMS capabilites not covered by the below list. This parameter is not present if the IMS registration status is "not registered".

1 RTP-based transfer of voice according to MMTEL, see 3GPP TS 24.173 [87]. This functionality can not be indicated if the UE is not available for voice over PS, see 3GPP TS 24.229 [89].

2 RTP-based transfer of text according to MMTEL, see 3GPP TS 24.173 [87].

4 SMS using IMS functionality, see 3GPP TS 24.341 [101].

8 RTP-based transfer of video according to MMTEL, see 3GPP TS 24.173 [87].

The hexadecimal values 10, 20, 40 … 80000 are reserved by the present document.

Example: The parameter <ext_info>=5 means that both RTP-based transfer of voice according to MMTEL and SMS using IMS functionality can be used.

Implementation

Optional.