Hello, On 7/12/11 8:06 PM, Spencer Thomason wrote: if you just remove it in the IF condition, then the second is better. is_present_hf() searches the through the header lists and returns true at first match or false when all headers were tried without a match. remove_hf() searches as well through the list of headers and removes when the name matches, going up to the last header. With latest CPUs processing power, probably will be an unnoticeable performance difference, all the operations are in memory. But the check for the existence of that header is prety much useless in your case. Cheers, Daniel -- Daniel-Constantin Mierla -- http://www.asipto.com Kamailio Advanced Training, Oct 10-13, Berlin: http://asipto.com/u/kat http://linkedin.com/in/miconda -- http://twitter.com/miconda