Question: What is the required format for the host portion of a Conference Factory URI in a telecommunications network, based on 3GPP specifications?
Option 1: sip:ims.mncXXX.mccYYY.3gppnetwork.org
Option 2: sip:conf-factory.mncXXX.mccYYY.3gppnetwork.net
Option 3: sip:conf-factory.ics.mncXXX.mccYYY.3gppnetwork.org
Option 4: sip:mncXXX.mccYYY.conf-factory.3gppnetwork.io
Explanation: According to the 3GPP specifications for Conference Factory URI, the host portion must be prefixed with 'conf-factory.' followed by the home network domain name, which typically includes 'ics' (indicating a specific configuration or service within the IMS) along with the Mobile Network Code (MNC) and Mobile Country Code (MCC) identifiers, all under the 3GPPnetwork.org domain. This ensures uniformity and correct routing for conference services within the network.