name: ISP
full_form: Internet Service Provider
context: The access to PDNs, or ISPs may involve specific functions such as: user authentication, userâs authorization, end to end encryption between MS and PDN/ISP, allocation of a dynamic address belonging to the PLMN/PDN/ISP addressing space, etc.
  For this purpose the PLMN may offer, based on configuration data:
  -	direct access to an IP based Intranet/ISP using a protocol configuration as depicted in figure 14. Here DHCP and/or RADIUS are used between the GGSN and Intranet/ISP for performing the specific functions mentioned above. The Packet Domain may also offer access to networks based on any protocol supported by PPP through one of its Network Control Protocols (NCPs);
  Figure 14: Protocol stack for direct access to IP-based Intranets/ISPs
  -	virtual dial-up access to a PDN with PPP frame tunnelling as depicted in figure 15.
  Figure 15: Protocol stack for virtual dial-up access with PPP frame tunnelling
description: The ISP is an external entity providing internet services, which the PLMN may offer access to.
explanation: Categorized as an Organization because it represents a provider of internet services.
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