The IP Multimedia Subsystem ( IMS ) may be deployed via the Internet on networks as defined by the 3rd Generation Partnership Project ( 3GPP ) .
The IP Multimedia Subsystem ( IMS ) is a standardised NGN architecture for an Internet media-services capability defined by the European Telecommunications Standards Instititue ( ETSI ) and the 3rd Generation Partnership Project ( 3GPP ) .In UK another popular acronym was introduced by BT ( British Telecom ) as 21CN ( 21st Century Networks , sometimes mistakenly quoted as C21N ) -- this is another loose term for NGN and denotes BT 's initiative to deploy and operate NGN switches and networks in the period 2006-2008 ( the aim being by 2008 BT to have only all-IP switches in their network )
Next-generation network