1. A method, comprising: filtering an ingress call based on a plurality of ingress-call parameter values, wherein filtering includes identifying a source of the ingress call and applying a common source policy to the ingress call based on the source, the common source policy including match parameters for matching ingress call parameters and set parameters for modifying ingress call parameters, wherein applying a common source policy includes modifying an ingress-call parameter of the ingress call based on one of the set parameters; converting a filtered ingress-call parameter value to an egress-call parameter value; filtering an egress call based on a plurality of egress-call parameter values, the plurality of egress-call parameter values including the egress-call parameter value; modifying a parameter value for the egress call based on a plurality of egress-call-peer parameter values; tagging the ingress call based on the ingress-call parameter values and the egress-call-peer parameter values, the modifying for the egress call being based on the tagged ingress call; and associating the ingress call with an ingress call peer based on the ingress-call parameter values and ingress-call-peer parameter values.