| CPC H04M 7/0081 (2013.01) [H04M 3/5183 (2013.01); H04M 7/0078 (2013.01)] | 25 Claims |

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1. A system comprising:
a data store storing data identifying values of a parameter in prior network calls on a network; and
one or more processors with computer-executable instructions to:
generate, from the values of the parameter in the prior network calls, a statistical validity model for the parameter that models a likelihood of one or more symbols occurring in an individual valid value for the parameter based at least in part on a likelihood of an individual symbol occurring at a specific position within the individual valid value;
obtain, from a computing device, a proposed value for the parameter of a proposed network call on the network;
apply the statistical validity model for the parameter to the proposed value to determine a likelihood that the proposed value is valid; and
return to the computing device a validation result indicating the likelihood that the proposed value is valid, wherein the computing device is configured to control submission of the proposed network call to the network according to the likelihood that the proposed value is valid.
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