Question: In the context of interworking between SIP and Bearer Independent Call Control protocol or ISDN User Part, which MIME type with a specific sub-type is supported for exchanging ISUP encapsulation in SIP messages between (G)MSC-Servers?
Option 1: text MIME type with the sub-type of ISUP
Option 2: application MIME type with the sub-type of ISUP
Option 3: multipart MIME type with the sub-type of ISUP
Option 4: audio MIME type with the sub-type of ISUP
Explanation: According to interworking specifications for SIP and Bearer Independent Call Control protocol or ISDN User Part, the correct MIME type for exchanging ISUP encapsulation in SIP messages between (G)MSC-Servers is indeed the application MIME type with the sub-type of ISUP. This specific formatting enables proper handling and interpretation of ISUP messages within the SIP framework, facilitating seamless interworking between these protocols in telecom networks.