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Labs rp.labs at gmx.chHello, I think there is a confusion here. The MS if it is not happy with the QoS will send a PDP modification request to change it or to change the traffic flow template. This can also be initiated by the network. A PDP context deactivation is used for deleting/removing a PDP context. There are 3 cases when this can happen and can also be initiated by MS or the network: a) GPRS detach b) remove subscriber data c) application deactivation Maybe someone else can explain it better. Regards, R. Sent from my iPad > On Jun 12, 2014, at 21:24, Josh toal <joshtoal17 at gmail.com> wrote: > > Hi All > > As per the specs after PDP context accept mobile station should exchange XID parameters with SGSN. before it initiate transfer of data. > > As per the literature mobile station if not happy with the negotiated quality of service it will send the deactivation request and I am getting the same. > > Is this is the only reason mobile station will send deactivation request or something else, which I am missing. > > Any suggestion to fix this problem. > > can anybody comment on this please. > > regards > Josh > > >