[S1] Ironically SIP is not the main protocol used by IMS  - False True

[S2] IMS is mostly not access network agnostic, due to the low layer protocols used by it  -  False True

[S3] Since IMS traffic is an application layer one, it seems to the GPRS core as any other data traffic, which travels over it  - False True

[S4] Without IMS it is possible that two GPRS users in the same room would exchange Instant Messages with  each other via an IM (Instant Messaging) server, which is located in a different country  - False True

[S5] IMS enables GPRS or/and UMTS phones (which run IMS client software) to make and receive phone calls. However, unfortunately IMS is a GPRS/UMTS based network and thus does not support CDMA and/or Wi-Fi phones  - False True