Error Indication: pIf the GSN does not find the PDP context corresponding to the received GTP-U data,
it instructs the peer GSN to delete the unmatched PDP context. pSignaling direction: nSGSN->GGSN; SGSN->RNC; nGGSN->SGSN; RNC->SGSN; nSGSN->SGSN lKey IEs of the Error Indication message: pTunnel Endpoint Identifier Data (mandatory): indicates the TEID fetched from the GTP
header of the G-PDU that triggered this procedure. pGSN Address (mandatory): indicates the destination IP fetched from the GTP header
of the G-PDU packet that triggered this procedure. lThe error indication message may also be generated when the GTP-U protocol is used at the user plane
between the SGSN and the RNC. | 
