public static IPAddressRange ParseSip(string sip)
{
if (string.IsNullOrWhiteSpace(sip))
{
throw new FormatException("sip is optional but cannot be empty");
}
string[] strArrays = sip.Split(new char[] { '-' });
if ((int)strArrays.Length > 2)
{
throw new FormatException("sip only supports one range");
}
if ((int)strArrays.Length != 2)
{
return(IPAddressRange.ParseIPV4(sip));
}
return(IPAddressRange.ParseIPV4(strArrays[0], strArrays[1]));
}