27 Service access number translation

29.1653GPPInter-IMS Network to Network Interface (NNI)Release 18TS

Based on inter-operator agreement, service access number translation may be supported over the II-NNI.

If service access number translation is supported, the related procedures in 3GPP TS 24.229 [5] shall be applied with the requirements in this clause.

The Request-URI containing a "cause" SIP URI parameter, defined in IETF RFC 4458 [58], set to the value "380" defined in IETF RFC 8119 [193] shall be supported at the II-NNI.

The History-Info header field containing a "cause" SIP URI parameter, defined in IETF RFC 4458 [58], set to the value "380" defined in IETF RFC 8119 [193] shall be supported at the II-NNI.