Will wireless, wireline and cable IMS networks be the same?
The IMS optimist would say that all the major standards groupsITU, ETSI, 3GPP, 3GPP2 and so onhave endorsed IMS, all are working to harmonize IMS standards among themselves, and eventually you will see but one IMS architecture. The pessimist would say that 3GPP is GSM-focused, 3GPP2 is CDMA-focused, and TISPAN is PSTN/ISDN-focused. All of these standards groups are supported by different telecoms (or divisions with a telecom), each is going after the same customer, and all will want service differentiation. Just like you have dozens of different wireless networks, you will see dozens of different IMS networks.
The IMS optimist would say that all the major standards groups—ITU, ETSI, 3GPP, 3GPP2 and so on—have endorsed IMS, all are working to harmonize IMS standards among themselves, and eventually you will see but one IMS architecture. The pessimist would say that 3GPP is GSM-focused, 3GPP2 is CDMA-focused, and TISPAN is PSTN/ISDN-focused. All of these standards groups are supported by different telecoms (or divisions with a telecom), each is going after the same customer, and all will want service differentiation. Just like you have dozens of different wireless networks, you will see dozens of different IMS networks.
