twilioclient/capabilities.go
func (c *Capability) AllowClientIncoming(clientName string) {
	c.shouldBuildIncomingScope = true
	c.incomingClientName = clientName
}
func (c *Capability) AllowClientIncoming(clientName string) {
	c.shouldBuildIncomingScope = true
	c.incomingClientName = clientName
}
// Registers this client to accept incoming calls by the given `clientName`.
// If your app TwiML <Dial>s `clientName`, this client will receive the call.