Patent ID: 7436805

Claim:
A call establishment method for a packet exchange network, in a network comprising: a user side system including terminal equipment (TE) and a radio access terminal (AT); and a network side system including a radio access network provided with a base station (BS) for establishing a radio link with the TE via the AT, and an PDSN for connecting the radio access network with a broadband network, the method for establishing a PPP connection between the TE and the PDSN comprising the steps of: sending an authentication request message from the TE to the PDSN; in reply to the authentication request message, sending an authentication response message by the AT substitutively; sending a user authentication request adopting a CHAP from the PDSN to the AT; and in response to the user authentication request, sending the user authentication request adopting the CHAP from the AT to the TE, wherein a packet format of the user authentication request sent from the PDSN to the AT does not contain at least one of an ID field, a Length field and a Name field.